The heatwave could bring the hottest June day on record since the drought of 1976, the Met Office has warned.

A health warning has been issued by Public Health England (PHE), who have urged families to keep an eye on their neighbours during the sweltering conditions.

The mercury peaked at 31.9C (89.4F) at Hampton Water Works in Greater London on Sunday - warmer than Thailand - which made it the hottest June 18 since records began 167 years ago.

Forecasters estimate temperatures of 33C on Monday and the potential of surpassing the 2011 June record of 33.1C towards midweek.