Forecasters predict highs of 34C (93F) in parts of eastern England such as Cambridgeshire, and 30C in the North East.

Experts say risk of 40C has almost trebled since 2000, with 50/50 chance of hitting that mark in next 12 years

Friday and Saturday nights will be uncomfortable for sleeping, with temperatures possibly staying above 20C (68F) in parts of the UK, which is known as a 'tropical night'.