Britain is set to swelter through another day of blistering heat after forecasters warned temperatures could climb as high as 33C again.

The Met Office said the criteria for a heatwave was met at Heathrow today when the mercury soared to 30C by 2pm.

Temperatures have soared across the country as Brits return to the office following the bank holiday weekend - people traveling have been advised to bring water with them amid the…