That’s because, across Europe, we put our clocks back by one hour ‘tonight’ to welcome back Greenwich Mean Time.
Why do the clocks change?
The website of Woodlands Junior School in Kent explains:
They've been changing the clocks forwards and backwards in the UK since 1916. It’s all to do with saving the hours of daylight, and was started by a man called William Willett, a London builder, who lived in Petts Wood in Kent (near our school).