system
A chat on subreddit /r/pcmasterrace
human
In the past. The UK moved from Fahrenheit to Celsius in the 60s for weather reports and then adopted metric currency in the 70s. But Fahrenheit remained as a secondary measure in weather forecasts for decades, probably well into the 90s. Older people would use 100 degrees as a way of saying the weather was really flipping hot.
gpt
the UK isn't Europe. /s 
Makes sense though since they still use miles and stones.