When do clocks go back in 2021 and why do we change the clocks in the UK?

The date clocks go back across the UK is just around the corner giving us an extra hour of sunlight as we approach winter.

from Warrington Guardian | News https://www.warringtonguardian.co.uk/news/19659518.clocks-go-back-2021-change-clocks-uk/?ref=rss
via Aerials Warrington