UK heat: Coastguard gets 'five times usual calls'
19 August 2012 Last updated at 19:57 BST
South-east and east England experienced the hottest day of the year so far on Saturday when temperatures peaked at 32.4C (90.3F) in Suffolk.
The BBC weather centre said the highest temperature recorded so far on Sunday was 30.9 (87.6F) in Cambridge.
The heat sent thousands heading for the sea, putting the coastguard under pressure.
Nicola Fox reports.