Here's the 20C club at midnight:
London Heathrow Airport (25 m) 23.8 °C
London St James Park (5 m) 23.1 °C
London City Airport (5 m) 22 °C
Odiham (118 m) 21.5 °C
Farnborough (64 m) 21.5 °C
Northolt (39 m) 21.0 °C
Solent MRSC (13 m) 20.7 °C
St Catherine's Pt (24 m) 20.5 °C
Filton (59 m) 20.2 °C
Kenley (170 m) 20.1 °C
Larkhill (133 m) 20.0 °C
Gatwick Airport (62 m) 20 °C
Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome