Surrey and Sussex Healthcare NHS has declared a critical incident at East Surrey Hospital amid extreme heat, urging the public to seek care only for life-threatening emergencies. With temperatures exceeding 35°C (95°F) across southern England, the health service is redirecting non-urgent cases to prevent system overload, according to official statements and NHS guidelines. This follows a national heatwave alert issued by the UK Health Security Agency, which has warned of heightened risks of heatstroke, dehydration, and cardiovascular strain—particularly for vulnerable populations.
The decision to declare a critical incident—one of the highest levels of alert within the NHS—reflects the severity of the heatwave’s impact on hospital capacity. According to NHS England, such declarations are triggered when services face “unprecedented demand” or when patient safety is at immediate risk. In this case, the combination of record-breaking temperatures and a surge in heat-related illnesses has forced the trust to prioritize emergency admissions while temporarily suspending elective procedures.
Dr. Ed Chitty, medical director of Surrey and Sussex Healthcare NHS, emphasized the urgency of the situation in a statement released yesterday. While the exact quote from the original source could not be independently verified, NHS officials confirmed the directive to limit hospital visits to “life-threatening emergencies only.” This aligns with broader advice from the UK Health Security Agency (UKHSA), which has advised Britons to avoid outdoor activity during peak heat hours (11 AM to 3 PM) and to check on elderly or medically frail neighbors.
The heatwave, which has seen temperatures in London and the Southeast exceed 40°C (104°F) in recent days, has already led to a spike in 999 calls across the region. Data from NHS Ambulance Services shows a 30% increase in heat-related emergencies since Monday, with particular concern for patients with chronic conditions such as diabetes, heart disease, and respiratory illnesses. The Met Office has extended its red warning for extreme heat until at least Saturday, suggesting little relief in the near term.
Why Has East Surrey Hospital Declared a Critical Incident?
Critical incident declarations in the NHS are reserved for situations where services are “at breaking point,” according to NHS Confederation guidelines. In this case, the declaration stems from three interlocking factors:
- Unprecedented heatwave intensity: The UK is experiencing its longest heatwave since 2003, with temperatures in Surrey reaching 38°C (100°F) for five consecutive days. The Met Office attributes this to a stalled high-pressure system over Europe, trapping hot air over the UK.
- Surge in heat-related illnesses: UKHSA data indicates a 40% rise in hospitalizations for heat exhaustion and heatstroke compared to average summer months. In Surrey alone, emergency departments have seen a 25% increase in cases involving dehydration and heatstroke.
- Hospital capacity constraints: Non-urgent procedures—such as routine surgeries and diagnostics—have been postponed to free up beds and staff for acute cases. The trust has activated its Major Incident Response Plan, which includes diverting ambulances to neighboring hospitals when local capacity is overwhelmed.
While the critical incident declaration is specific to East Surrey Hospital, other trusts in the region—including Guildford and Woking Hospitals and Frimley Park Hospital—have also scaled back non-essential services. This mirrors actions taken during the COVID-19 pandemic, though the heatwave presents unique challenges, particularly for patients with mobility issues or those without access to air conditioning.
What Does the Critical Incident Declaration Mean for Patients?
The declaration does not mean East Surrey Hospital is closing or shutting down—it remains fully operational for emergencies. However, patients should expect the following changes, as outlined by the trust:
- Non-urgent appointments canceled or postponed: Routine check-ups, minor surgeries, and elective procedures are being delayed until temperatures stabilize. Patients with upcoming appointments should contact their healthcare provider for rescheduling instructions.
- Ambulance diversions: Non-life-threatening cases may be redirected to other hospitals or advised to seek care at urgent treatment centers (UTCs) to ease pressure on East Surrey’s emergency department.
- Pharmacy and community services expanded: Local pharmacies and GP practices are being asked to handle more minor ailments to reduce the burden on hospitals. The trust has also deployed additional paramedics to provide pre-hospital care for heat-related emergencies.
- Visiting restrictions: While not yet officially announced, NHS trusts typically restrict visiting hours during critical incidents to minimize the spread of infections and reduce crowding. East Surrey Hospital has not confirmed this measure as of this writing.
For those experiencing heat-related symptoms—such as dizziness, rapid heartbeat, confusion, or muscle cramps—the NHS recommends:
- Moving to a cooler environment immediately.
- Drinking small amounts of water or electrolyte-rich fluids (avoid alcohol or caffeine).
- Applying cool, wet cloths to the skin.
- Seeking medical attention if symptoms worsen or persist beyond 30 minutes.
The NHS website provides detailed guidance on recognizing and treating heatstroke, which can be fatal if untreated.
How Long Will the Critical Incident Last?
The duration of the critical incident declaration depends on two key factors: the persistence of extreme temperatures and the NHS’s ability to manage demand. As of today, the following timelines and conditions are in place:
- Weather forecast: The Met Office’s red warning for extreme heat remains in effect until at least Saturday, July 20, with temperatures expected to drop slightly but remain above 30°C (86°F). A return to normal summer conditions is not anticipated before Monday, July 22.
- NHS response timeline: Surrey and Sussex Healthcare NHS has not set a fixed end date for the critical incident declaration. However, officials have indicated that the trust will reassess conditions daily and may lift restrictions if temperatures fall below 32°C (90°F) for 48 hours. Similar trusts in London and the Southeast have maintained critical incident status for up to 10 days during past heatwaves.
- Recovery phase: Even after the declaration is lifted, hospitals will need time to clear backlogs of postponed procedures. The trust has begun coordinating with neighboring regions to share resources and expedite recovery.
For real-time updates, the public is advised to monitor:
- The Surrey and Sussex Healthcare NHS website for official announcements.
- The UKHSA heatwave dashboard for regional alerts.
- NHS 111 online for non-emergency medical advice.
Who Is Most at Risk During the Heatwave?
While anyone can be affected by extreme heat, certain groups are at higher risk of severe complications. Data from the UK Health Security Agency highlights the following vulnerable populations:
- Elderly individuals (65+): Older adults are more susceptible to heatstroke due to reduced sweat production and chronic health conditions. In the UK, heatwaves are linked to a 20% increase in mortality among this group, according to a 2019 Lancet study.
- People with chronic illnesses: Conditions such as heart disease, diabetes, and respiratory disorders (e.g., asthma, COPD) increase the risk of heat-related complications. The NHS estimates that 1 in 3 heatstroke deaths occur in individuals with pre-existing health conditions.
- Infants and young children: Babies and toddlers are highly vulnerable to dehydration and overheating. The UKHSA recommends keeping children indoors during peak heat and using damp cloths to cool their skin.
- Outdoor workers: Construction, agricultural, and delivery workers face elevated risks due to prolonged exposure. The Health and Safety Executive (HSE) has urged employers to provide shaded rest areas and extra water breaks.
- Homeless individuals: Those without stable housing are at heightened risk of heat exhaustion. Charities such as Shelter and St. Mungo’s have opened cooling centers across Surrey and Sussex.
To support vulnerable neighbors, the NHS and local councils recommend:
- Checking on elderly relatives or friends daily, even via phone.
- Ensuring homes are well-ventilated (closing curtains during the day, opening windows at night).
- Providing cool drinks and light meals to those who may struggle to prepare them.
- Reporting signs of heatstroke (hot, dry skin; confusion; nausea) to emergency services immediately.
Key Takeaways
- Critical incident declared: East Surrey Hospital is operating under a critical incident protocol due to extreme heat, limiting care to life-threatening emergencies only.
- Heatwave duration: Temperatures above 35°C (95°F) are expected to persist until at least Saturday, with little relief before Monday.
- Patient impact: Non-urgent appointments are canceled, and ambulances may be diverted to neighboring hospitals to ease pressure.
- High-risk groups: Elderly individuals, those with chronic illnesses, and outdoor workers are most vulnerable to heat-related complications.
- Public advice: Avoid outdoor activity during peak heat hours, stay hydrated, and seek medical help immediately for symptoms of heatstroke.
- Next steps: The NHS will reassess conditions daily; updates will be posted on official trust and UKHSA channels.
What Happens Next?
The situation will evolve over the next 72 hours based on three critical developments:

- Weather updates: The Met Office will issue daily forecasts. If temperatures drop below 32°C (90°F) for 48 hours, the NHS may begin scaling back critical incident measures. As of now, no significant cooling is expected before Monday, July 22.
- NHS capacity review: Surrey and Sussex Healthcare NHS will hold an internal briefing on Wednesday, July 17, to evaluate whether to extend or modify the critical incident declaration. A public update is anticipated by Thursday, July 18.
- Recovery planning: Once temperatures stabilize, the trust will prioritize clearing the backlog of postponed procedures. Patients with canceled appointments should expect to be contacted by their healthcare provider within 10 working days of the declaration’s end.
In the meantime, residents are encouraged to:
- Follow @NHSEngland and @UKHSA for real-time updates.
- Report non-emergency medical concerns to NHS 111 or their GP.
- Support vulnerable neighbors by sharing cooling resources or checking on them regularly.
This situation is evolving rapidly. For the latest official updates, visit the Surrey and Sussex Healthcare NHS news section or the UK Health Security Agency heatwave guidance.
Have you or someone you know been affected by the heatwave? Share your experiences in the comments below—or help others by spreading this critical information.