The UK had a week of hot weather in early August 2003. I was there a few days earlier freezing my tail off at the beach in Christchurch. Coldest summer beach day of my life.
All of the hottest temperatures during that heatwave were right around the urban heat island of London.
The hottest day was August 9th. One thermometer at Heathrow reported 100 degrees, and another one close by reported 95 degrees, It is amazing what jet exhaust can do to a thermometer.
Temperatures reported so far this year in the GHCN database are much lower than 2003, but I will wait a few days to see how that changes. (With my new tools, alarmists are in a lot of trouble.)