Jersey looks like taking the crown today as the warmest SYNOP station in WMO block #03, with a temperature just over 90°F at 14 UTC (fig 1).
Here in Bradninch mid-Devon, the temperature has been hovering around 30 or 31°C for much of the afternoon, so to escape the sun that I’d string some code together and look at a couple of thermographs since Saturday for Exeter (fig 2) and Heathrow (fig 3).
Not bad going for Devon, when you consider that Exeter is always starting several degrees cooler than Heathrow each day. I think the sea breeze just kicked in time to prevent the temperature at Exeter airport possibly exceeding 31°C at 14 UTC, as it did here in Bradninch. My Vantage Pro has been recording temperature since September 2004 and this afternoon’s max of 31.3°C makes it the warmest June day in that time.