If you are responsible for facilities, health and safety or business continuity across more than one site, you already know that winter finds every gap in your planning at once — and that it finds them at your least-staffed site, on the worst morning, while the road to your best-resourced site is closed.

What is unusual about winter is that it is the only risk on your register with a publication schedule. The alerting systems switch on at fixed dates. The Cold-Health Alert season opens on 1 November and closes on 31 March. Suppliers of winter provision see demand concentrate sharply in the autumn. And the gap between “we should sort that out” and “we cannot get it delivered in time” opens in roughly the same fortnight every year.

This is a month-by-month timeline for the next eight months, built around the official services you should be plugged into — including a note on which of them stop at the English border, because most multi-site estates cross it.

First: which official services cover which nations

This matters more than it sounds. Three of the five services below are not UK-wide, and a national estate that registers once, centrally, will end up with sites that are not covered by anything.

Met Office warnings (UK-wide). The Met Office issues warnings so that “people, businesses, emergency responders and governments know what weather is in store and what the impacts of that weather may be.” Eight hazards are covered: rain, thunderstorms, wind, snow, lightning, ice, extreme heat and fog. Yellow is issued when “it is likely that the weather will cause some low level impacts, including some disruption to travel in a few places”, or where more severe impacts are possible but less certain. Amber signals “an increased likelihood of impacts from severe weather”, with “the possibility of travel delays, road and rail closures, power cuts and the potential risk to life and property.” Red means “dangerous weather is expected” and “it is very likely that there will be a risk to life, with substantial disruption to travel, energy supplies and possibly widespread damage to property and infrastructure.”

UKHSA Weather-Health Alerts (England only). Operated by UKHSA with the Met Office, with a joint risk assessment behind each alert. The Cold-Health Alert season runs 1 November to 31 March. The system has four levels — green means no alert is issued, then yellow, amber and red as impact and likelihood rise. Alerts are aimed at “professionals within the health and social care sector and those who have a role in responding to cold weather to protect health”, but they are freely available and sent by email to anyone who registers. UKHSA is explicit that “Weather-Health Alerts cover England only due to this being a devolved responsibility in Scotland, Wales and Northern Ireland.” There is no equivalent alerting service in the other three nations — Public Health Scotland works to an Adverse Weather and Health Plan, Public Health Wales and nidirect publish guidance, and all three rely on Met Office warnings for the trigger.

Flood warnings (four different arrangements). In England, register with the Environment Agency. In Scotland, SEPA runs Floodline and myfloodline registration. In Wales, Natural Resources Wales runs the equivalent. Northern Ireland has no property-level flood warning registration service — official sources point to Flood Maps NI, which is explicitly not accurate at individual property level, and the Flooding Incident Line on 0300 2000 100 for reporting. An NI site therefore needs a plan that does not assume a warning will arrive.

Around 6.3 million properties in England sit in areas at risk of flooding from rivers, the sea, surface water or a combination, according to the Environment Agency’s 2024 national assessment. In October 2025 the Agency’s polling found 45% of the public had not looked up the flood risk for their home. For an estate, “check your flood risk” means checking every site — including the car park, the substation and the goods entrance, not just the building.

NESO Winter Outlook (Great Britain). The Early View for winter 2026/27 gives a de-rated margin of 5.5GW, or 8.8% above expected peak demand, based on modelling around 30,000 scenarios. NESO notes that “some periods may be more finely balanced, particularly in January, but NESO has established operational tools to manage tighter days and keep the system secure.” A fuller Winter Outlook follows later in the year. Northern Ireland is not in scope: it sits in the Single Electricity Market, and SONI publishes its own winter outlook.

One reframing before you act on that margin. A comfortable national margin is not what will turn your lights off. Sites lose power to local distribution faults from wind, ice and fallen trees, not to national capacity shortfalls. The more useful thing to have on the incident card is the power cut number: 105 is free from England, Scotland and Wales; in Northern Ireland it is 03457 643643 for NIE Networks.

The timeline

August — the two things with the longest lead times

You are reading this in August, so start here.

• Gritting contracts. These are tendered and allocated over the summer. Ask your contractor, in writing, where you sit on their route. If they have two hundred clients and you are tier three, you are gritted at 11am — after the incident, not before it.
• Bespoke or standardised kit specification. If you want every site holding the same defined provision rather than whatever each site bought locally, the specification work needs to happen before the ordering month, not during it.

September — audit, specify, and write the difficult policy

The quiet month, and the one that determines whether the rest of this is manageable.

• Physically inspect winter stock at every site. Not the inventory spreadsheet — the actual cupboard. Expired items, missing items and “someone borrowed it” are only visible in person.
• Check expiry dates on first aid consumables, emergency food, batteries and lights. Anything expiring before April gets replaced now.
• Write the adverse weather policy, including pay. Can staff not get in? Is it leave, unpaid, or homeworking? Deciding this in January, site by site, produces five different answers and an HR problem. Deciding it in September produces one answer.
• Check first aid and fire warden cover against the winter calendar. HSE’s guidance is direct: “You will also need to increase your provision to cover for absences”, and employers should consider “what cover is needed for annual leave and other planned absences” as well as “unplanned and exceptional absences”. Winter is when both spike at once.
• Write your escalation thresholds down — see the worked example below — and get them signed off. Left to judgement, five site managers facing the same warning will make five different calls.
• Review last winter’s incident log. Whatever failed last February will fail again unless someone changed it.
• Register for the alerting services relevant to each site’s nation, per the table above.

October — order, before the market tightens

• Place the orders identified in September. Ordering in October and ordering in December are materially different experiences. We are the supplier telling you this, so weight it accordingly — but the pattern is consistent enough that the whole timeline is built around it.
• Salt and gritting stock. Note that the National Emergency Salt Reserve held by the Department for Transport and National Highways is “salt of last resort” for local highway authorities in England — it is sold to qualifying authorities under a protocol, not available to businesses. Your car park is entirely your own problem.
• Count and refill grit bins, and name who is responsible for each. Half of them are empty by January because someone else took the salt.
• Flood Action Week, which the Environment Agency usually runs in October (an England campaign, but a useful prompt estate-wide), is a natural prompt for a site-by-site flood plan review.
• Test what you assume works — but test it properly. An off-load generator test proves the engine starts and very little else. What matters is an on-load test, the run time achievable on the fuel actually held, and fuel condition after a summer standing still.
• Read the full NESO Winter Outlook when it publishes.

November — the season opens, and the ice starts

The Cold-Health Alert season begins on 1 November.

• Gritting goes live. Under regulation 12 of the Workplace (Health, Safety and Welfare) Regulations 1992 (Great Britain; Northern Ireland has its own equivalent regulations, identically numbered, enforced by HSENI), floors and traffic routes must not be “uneven or slippery so as… to expose any person to a risk to his health or safety”, and must be kept free, so far as is reasonably practicable, of anything “which may cause a person to slip, trip or fall”. The Regulations define a traffic route to include ramps and loading bays, and cover private site roads used for access; public roads are excluded. The supporting Approved Code of Practice is explicit: “Arrangements should be made to minimise risks from snow and ice. This may involve gritting, snow clearing and closure of some routes, particularly outside stairs, ladders and walkways on roofs.” HSE’s practical advice on timing is that “the best times are early in evening before the frost settles and/or early in the morning before employees arrive.” HSE’s trigger is surface temperature, not air temperature: grit when “the floor temperatures are at, or below, freezing”. And keep the log: date, time, who, what was treated, which forecast was relied on. When a slip claim lands eighteen months later, the log is the defence.
• Check heating against the number HSE expects you to justify departing from. Regulation 7 requires that “during working hours, the temperature in all workplaces inside buildings shall be reasonable.” The Approved Code of Practice suggests the minimum “should normally be at least 16°C, or 13°C if much of the work involves rigorous physical effort.” That is guidance rather than a prescribed legal minimum, but it is the figure an inspector will start from.
• Plan compliant temporary heating now, before a boiler fails and someone brings in an unflued portable gas heater. HSE identifies LPG equipment used in enclosed spaces as a carbon monoxide risk, requiring adequate ventilation and installation by a competent person; HSENI’s advice is that “only equipment designed to be used indoors should be brought inside”.
• Rethink your evacuation, not just your fire plan. A 07:30 alarm in January puts people outside in the dark at 2°C, possibly for 45 minutes. Is the assembly point lit? Can it be reached without crossing untreated ice? Do wardens have torches, hi-vis, foil blankets and a means of accounting for people in the dark? A grab bag specified in summer is not the same bag.
• Distribute vehicle kits — including to grey fleet, staff using their own cars on company business. HSE is clear that “vehicles should be properly equipped to operate in poor weather conditions such as snow, ice and high winds”, that employers should not “pressure drivers and riders to complete journeys where weather conditions are exceptionally difficult”, and should “support drivers and riders if they need to cancel a journey”.
• Run a comms test. Can you reach every site manager within 30 minutes on a Sunday? Find out in November.

Late December — the window everyone forgets

Roughly 23 December to 2 January is the highest-risk window on most estates: buildings empty, heating on setback, skeleton or zero staff, keyholders abroad, contractors closed, deliveries stopped. Four things converge.

• Frozen and burst pipes. Heating setback plus an empty building plus a freeze-thaw cycle is the classic escape-of-water loss. Check what your own property policy says about unoccupancy: conditions requiring drain-down or a maintained minimum temperature beyond a stated number of unoccupied days are common, and breaching one can affect cover.
• Legionella on reopening. HSE’s HSG274 Part 2 advises that where outlets are not in regular use, “weekly flushing of these devices for several minutes can significantly reduce the risk of legionella proliferation”, and that systems taken out of use should be recommissioned “as though they were new” before returning to service. Two weeks of stagnation followed by everyone running the taps at once is exactly the scenario the guidance addresses.
• Skeleton and agency cover. Who is the trained first aider on 28 December? Who is the fire warden? Have agency staff seen the assembly point — in the dark? Note also that PPE duties in Great Britain were extended to “limb (b)” casual and agency workers from 6 April 2022, and in Northern Ireland from 21 October 2024, so thermal PPE for outdoor workers is not an employees-only duty.
• Roof and snow loading. Drifting against parapets and plant, blocked rainwater outlets, then a freeze. Post-snowfall inspection matters — but do not send anyone onto a snow-covered roof without a specific plan. HSE’s roof work guidance puts it plainly: “rain, ice or snow can make a secure footing as slippery as a skating rink”, and falls through fragile surfaces such as rooflights account for 22% of all fatal falls from height in construction.

January and February — operate

• Put alerts on a rota, not a routine. Warnings arrive by email and push notification; nobody needs to go looking for them. What you need is a named duty person, out of hours included, with a phone that is on, and a documented handover each Friday. Winter’s worst weekends are the ones where three people each assumed one of the others was watching.
• Apply your written thresholds rather than relitigating them each time a warning appears.
• Watch January specifically, per NESO’s flag on tighter margins.
• Plan for water supply interruption. Freeze-thaw bursts mains, and without drinking water and sanitary conveniences you are in breach of regulations 20 and 22 and liable to enforcement — regulation 22 requires “an adequate supply of wholesome drinking water… for all persons at work in the workplace”. Bottled water provision is a cheap hedge against a hard closure trigger.
• Log every incident and near miss as it happens. Memory is unreliable by March.

March — close out

The Cold-Health Alert season ends on 31 March.

• Debrief while it is fresh. What ran out? What was missing? Which site improvised, and with what?
• Replenish immediately rather than deferring to autumn — the work is already scoped.
• Feed the findings into the budget cycle, which for most organisations is being set right about then.

A worked threshold, to copy and argue with

Here is one to start from.

• Amber warning for snow or ice covering the site, in force before 06:00 → gritting contractor called at 04:00; site opens late at 10:00; site manager confirms car park treated before staff arrive; no non-essential travel between sites.
• Amber warning plus untreated car park at 06:00, or heating failure with internal temperature below 13°C (set higher, at 16°C, for sedentary work — see the ACOP figures above) → site closed for the day; homeworking where the role allows; adverse weather pay policy applies as written.
• Red warning covering the site → site closed; nobody is asked to travel, including managers, including to check the building. Building checks resume when the warning lapses.
• Two or more sites affected simultaneously → decision escalates from site manager to a named regional role, to keep the calls consistent across the estate.

What breaks when you scale this across an estate

Provision drifts. Stock standardised in year one diverges by year three as sites borrow, substitute and forget. The fix is one specification held centrally and audited physically — not a policy saying sites are responsible for themselves.

Response capacity is never where the incident is. Your best-resourced site is rarely the one that floods, and the weather that closes site A usually closes the road to site B. Mutual aid between sites is a plan that fails precisely when invoked. Each site needs to stand alone. The government’s Prepare campaign advises considering what supplies you might need “during an emergency lasting a few days”; we plan to 72 hours as a working convention.

Escalation decisions get made inconsistently. Five site managers facing the same amber warning will make five different calls. That is a specification problem, not a competence problem.

One note on this particular winter

As we covered in our El Niño article, the Met Office’s tilt for 2026–27 points mildly toward a wetter, windier autumn and early winter, and possibly a colder, calmer late winter — while stressing that such links are “far from guaranteed” and that it is “too early to draw firm conclusions”. Treat it as a tie-breaker, not a forecast. If it changes anything above, it slightly favours wind and surface-water work in the October column. It is not a reason to defer late-winter cold provision.

The short version

Winter is the one risk on your register with a publication schedule. What separates a manageable February from a bad one is unglamorous and it happens now: someone opens the actual cupboard at every site, someone signs the gritting contract before the market tightens, and someone writes down what “too severe to open” means before the first amber warning of the season.

If you would rather not build the specification yourself, that is the work we do: standardised winter and emergency provision written once and applied across every site, so you audit against one document instead of five. That covers winter site kits, vehicle and grey-fleet kits, emergency lighting and power, thermal and welfare provision, and bespoke solutions where the standard lines do not fit the site. We have been doing it for UK organisations since 2005. Talk to us about your requirements.

Sources

All sources below are UK government departments, regulators, the national meteorological service, or the relevant electricity system operator.

1. Met Office — Weather warnings guide (National Severe Weather Warning Service) — https://weather.metoffice.gov.uk/guides/warnings
2. Met Office — Weather services for contingency planners (3-month outlook) — https://www.metoffice.gov.uk/services/government/contingency-planners
3. UKHSA — Weather-Health Alerting System — https://www.gov.uk/guidance/weather-health-alerting-system
4. UKHSA — Cold-Health Alerting system: overview (applies to England) — https://www.gov.uk/guidance/cold-health-alerting-system-overview
5. UKHSA blog — What is the difference between Weather-Health Alerts and Severe Weather Warnings?, 8 January 2026 — https://ukhsa.blog.gov.uk/2026/01/08/what-is-the-difference-between-weather-health-alerts-and-severe-weather-warnings/
6. Public Health Scotland — Adverse Weather and Health Plan 2024–2027 — https://publichealthscotland.scot/publications/phs-adverse-weather-and-health-plan-2024-2027/phs-adverse-weather-and-health-plan-2024-2027/
7. Environment Agency — Get flood warnings by text, phone or email — https://www.gov.uk/get-flood-warnings
8. SEPA — Flooding and Floodline (Scotland) — https://beta.sepa.scot/flooding
9. Natural Resources Wales — Sign up to receive flood warnings — https://naturalresources.wales/flooding/sign-up-to-receive-flood-warnings/?lang=en
10. Department for Infrastructure (NI) — What is Flood Maps NI — https://www.infrastructure-ni.gov.uk/articles/what-flood-maps-ni and nidirect — Reporting flooding — https://www.nidirect.gov.uk/articles/reporting-flooding
11. Environment Agency — National assessment of flood and coastal erosion risk in England 2024 — https://www.gov.uk/government/publications/national-assessment-of-flood-and-coastal-erosion-risk-in-england-2024 (6.3 million figure: EA announcement, 17 December 2024)
12. Environment Agency — Public urged to get flood ready as Environment Agency launches Flood Action Week, 13 October 2025 — https://www.gov.uk/government/news/public-urged-to-get-flood-ready-as-environment-agency-launches-flood-action-week
13. NESO — Winter Outlook (Early View, winter 2026/27, Great Britain) — https://www.neso.energy/publications/winter-outlook
14. SONI — Maintaining secure electricity supply (Northern Ireland) — https://www.soni.ltd.uk/grid/maintaining-secure-electricity-supply
15. Energy Networks Association — 105 service — https://www.energynetworks.org/work/105-service ; HM Government Prepare — power cuts — https://prepare.campaign.gov.uk/be-informed-about-hazards/power-cuts/
16. HSE — Temperature in the workplace: what the law says — https://www.hse.gov.uk/temperature/employer/the-law.htm
17. The Workplace (Health, Safety and Welfare) Regulations 1992, regulations 7, 12, 20 and 22 — https://www.legislation.gov.uk/uksi/1992/3004/contents (Northern Ireland equivalent: SR 1993 No. 37 — https://www.legislation.gov.uk/nisr/1993/37/made)
18. HSE — Workplace health, safety and welfare: Approved Code of Practice and guidance (L24), paragraph 116 — https://www.hse.gov.uk/pubns/priced/l24.pdf
19. HSE — Slips and trips: frequently asked questions (gritting timing) — https://www.hse.gov.uk/slips/faq.htm
20. HSE — Legionnaires’ disease: Part 2 — hot and cold water systems (HSG274) — https://www.hse.gov.uk/pubns/priced/hsg274part2.pdf
21. HSE — First aid at work: your questions answered (INDG214) — https://www.hse.gov.uk/pubns/indg214.pdf
22. HSE — Driving and riding safely for work: plan and manage journeys — https://www.hse.gov.uk/roadsafety/employer/plan-manage-journeys.htm
23. HSE — Health and safety in roof work (HSG33), paragraph 64 — https://www.hse.gov.uk/pubns/priced/hsg33.pdf — and Fragile surfaces — https://www.hse.gov.uk/construction/safetytopics/fragile.htm
24. HSE — Carbon monoxide (LPG in enclosed spaces) — https://www.hse.gov.uk/construction/healthrisks/hazardous-substances/carbon-monoxide.htm ; HSENI — Carbon monoxide dangers — https://www.hseni.gov.uk/news/carbon-monoxide-dangers-heating-appliances-and-generators-used-indoors
25. HSE — PPE at work regulations 2022 (limb (b) workers, Great Britain, in force 6 April 2022) — https://www.hse.gov.uk/ppe/ppe-regulations-2022.htm — and The Personal Protective Equipment at Work (Amendment) Regulations (Northern Ireland) 2024, SR 2024 No. 161, in operation 21 October 2024 — https://www.legislation.gov.uk/nisr/2024/161/made
26. Department for Transport — National Emergency Salt Reserve: salt protocol — https://www.gov.uk/government/publications/strategic-salt-protocol
27. HM Government — Prepare campaign — https://prepare.campaign.gov.uk/
28. Met Office — El Niño declared for 2026 as Pacific warms, 11 June 2026 — https://www.metoffice.gov.uk/blog/2026/el-nio-declared-for-2026-as-pacific-warms
29. Met Office — Pacific Ocean warming signals the possible return of a strong El Niño, 15 April 2026 — https://www.metoffice.gov.uk/blog/2026/met-office-what-is-el-nino-and-will-we-see-one-this-year