This chart shows the highest temperatures ever recorded in the UK, as of July 25, 2019.
On the record – observing a 'heatwave
Guest post: A Met Office review of the UK's record-breaking summer
a)Global temperature trend during last 150 years and the hottest
TIL that the highest temperature ever recorded in Scotland was
What is the highest temperature ever recorded in the UK?
Mapping the hottest temperatures around the world
U.K. breaks record for highest temperature : NPR
East Malling records highest temperature in the UK during hot spell
Why does the temperature record shown on your Vital Signs page
Global Temperature Report for 2023 - Berkeley Earth