High-levels warnings have come into force for five areas as the UK melts amid a 36c heatwave with Brits warned of the "significant impact" from the searing temperatures. London, West Midlands, East Midlands, the South East and East of England are now under a heat health alert as of 9am this morning . It will remain in place until 6pm on Wednesday 13, with a yellow alert now issued for the North West and North East for the same period. The new warning from the UK Health Security Agency says