The clocks go one hour forward on Sunday 29 March 2015 at 1am, heralding in British Summer Time, lighter nights and (hopefully) better weather as spring gets well underway.
The clocks go back again in autumn in the early hours of Sunday, 25 October 2015.
The hour changes in spring and autumn in an attempt to make the most of the light.
If you struggle with which is which, this, albeit of North American origin, might help you remember: “Spring forward, fall back”.
Fall being the American term for autumn.