When do the clocks change in the UK?

The rule

British Summer Time begins on the last Sunday in March, when clocks go forward at one in the morning and you lose an hour. It ends on the last Sunday in October, when they go back at two in the morning and you gain one.

The next few

Back on Sunday 25 October 2026. Forward on Sunday 28 March 2027, which is also Easter Sunday, so that particular night costs an hour twice over if you had plans.

What it changes in London

Sunset moves by an hour overnight. The October change is the point at which the city turns into its winter self: dark by five, then dark by four within a month.