Warnings on water use, transport and risks to health as heat heads for 41C

Airport runways close and 999 calls surge while Boris Johnson is accused of checking out' by attending airshow but not Cobra meeting

Airport runways have been closed and 999 calls have surged as Britain endured some of the hottest temperatures on record, which are forecast to rise again on Tuesday to a record-breaking 41C (106F) in parts of southern and central England.

Boris Johnson was accused of being checked out", as the prime minister missed an emergency Cobra meeting about the searing heat and attended the Farnborough airshow, where he gave a whimsical speech about completing a loop the loop and a barrel roll in a Typhoon fighter jet.