My two closest Met Office stations are Odiham and Farnborough. They hit -7.9 and -7.5 respectively. Quite rare for Odiham to be colder on frosty nights as it is a lot higher whereas Farnborough is in a frost hollow. My car thermometer on the driveway only reached -4C when I switched it on at 7.30 though.
Even Heathrow hit a respectable -8.2C - not bad for a spot close to London with no snow! Benson reached -8.7C with -13C on the grass.
Originally Posted by: Rob K