Clocks Go Forward 2025 Uk Impact. On 27 october clocks will turn back by one hour, as we change from british summer time (bst) to greenwich mean time (gmt). The period when the clocks are 1 hour ahead is called.

But why do the clocks change, and when did the practice start? On 27 october clocks will turn back by one hour, as we change from british summer time (bst) to greenwich mean time (gmt).