The hottest June day record has been smashed again after the Met Office extended its rare red weather warning for extreme heat in London and the South East. A provisional temperature of 36.7 was reached in Merryfield, Somerset, on Thursday, exceeding yesterday’s record of 36.1C at Gosport, Hampshire. The Met Office expects the “exceptional spell of hot and humid weather” to continue until Friday night, along with thunderstorms that will bring heavy rain and lightning to most of the UK. Watch