Avalanches can be deadly, and they do happen in the UK. Always consider the conditions before embarking on your adventure, and keep a close eye while you're out there in case things suddenly change.
The BMC recommend the acronym B.A.D. to stay vigilant at all times:
Before your ascent, check the terrain you'll be walking on, the weather and avalanche forecasts, and the ability/experience of those in your party.
On your approach, keep an eye on the angle of the terrain, the conditions at altitude and how everyone in the group is feeling.
During your ascent, continuously evaluate whether you should continue the trek or turn back. Identify escape routes and safety locations, keep checking the terrain, and make sure everyone in your group is happy to continue.