Four teenagers and a man in his 60s have died in separate incidents during a UK heatwave, leading the Royal National Lifeboat Institution (RNLI) to issue a safety warning about cold water shock. Despite record high air temperatures, British waters remain dangerously cold, raising concerns for safety as many flock to the coast and waterways.

• 01Four teenagers died in separate incidents during the UK heatwave, with fatalities occurring in Lincolnshire, West Yorkshire, Warwickshire, and South Yorkshire.
• 02A man in his 60s died after suffering a cardiac arrest while rescuing family members at Tregirls Beach in Cornwall.
• 03The RNLI warns that cold water shock poses a risk even to experienced swimmers, as water temperatures remain dangerously low despite high air temperatures.
• 04Emergency services are advising against swimming in unpatrolled waters, quarries, and rivers, especially during the school half-term holidays.
• 05The RNLI urges the public to remain cautious and to swim only in designated lifeguarded areas.

The tragic deaths during the heatwave raise awareness about the dangers of swimming in cold waters, especially for teenagers and families during the school holidays.