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Today has provisionally been the warmest Christmas Eve since 1997, the Met Office said.
The forecaster said temperatures in Heathrow reached 15.3C.
The warmest Christmas Eve on record was in 1931, when 15.5C was recorded in Aberdeen and Banff in Scotland.
Met Office forecaster Liam Eslick said: “It’s been an exceptionally mild couple of days across all of the UK, temperatures have been well above average for the time of year.
“Temperatures today have reached 15C in quite a few locations across the UK, the highest being 15.3C in two locations – one in Heathrow and one in Cippenham, Berkshire.”