A temperature of 38.7C was recorded in Cambridge on Thursday, which – if confirmed – would be a new temperature record for the UK.
Experts have warned the UK will suffer such record temperatures more often in future – with 40C becoming the “new normal”.
The Met Office said the record 38.7C figure was received from Cambridge Botanic Garden yesterday.
Related: Flash flood warnings as UK set for weekend washout
If validated, it will become the highest temperature officially recorded in the UK, outstripping the 38.5C seen in Faversham, Kent, in August 2003.