Looks like 27C was the high yesterday:http://www.weatheronline.co.uk/weather/maps/current?LANG=en&DATE=1344596400&CONT=euro&LAND=UK&KEY=UK&SORT=3&INT=06&TYP=tmax&ART=tabelle&RUBRIK=akt&R=310&CEL=C(The 31C can be discounted as a dodgy reading IMO; the station spent the afternoon in the low 20s).
EDIT: 27.3C at Northolt was the max:
http://www.metoffice.gov.uk/weather/uk/uk_latest_weather.html
Today's max should be similar but further west this time due to an increasing easterly wind.
Edited by user 11 August 2012 06:09:44(UTC) | Reason: Not specified
Yes, even here there's a brisk wind making it feel fresh this morning
Cooler than yesterday at 26.1C today but a very nice day today.