Britain is waking from the hottest May night on record as millions of people head back to work this morning after a sweltering Bank Holiday weekend. Temperatures did not drop below 21.3C overnight at Kenley Airfield, south London, making it a 'tropical night', the Met Office said.The mercury is set to rise even further today to an unprecedented 36C - and you can check out if temperatures will reach record-breaking levels in your area using our interactive tool below. Yesterday, the UK experienced its hottest Bank Holiday of all time after a searing 34.8C was recorded in Kew Gardens, south-west London. This also surpassed the highest May day temperature of 32.8C recorded in 1944. It comes as millions prepare to head back to air-conditioned offices this morning on packed trains, tubes and buses. Transport for London has advised people using its services to carry water with them when travelling. Yesterday, tens of thousands of Britons flocked to the coast and beauty spots to bask in the blistering heat despite official government guidance to stay out of the sun. A 13-year-old boy died after getting into difficulty while swimming at Leadbeater Dam in Halifax. His body was pulled from the water at 3.18pm yesterday and he was taken to hospital where he was pronounced dead.