An analysis by the UK’s Met Office of future temperatures under global warming has found that 40°C days could become frequent in the future. The current UK record is 38.7°C, set in 2019
Source:
https://www.newscientist.com/article/2247434-uk-could-see-40c-days-every-few-years-by-2100-as-climate-warms/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home