Time in the United Kingdom
The United Kingdom uses Greenwich Mean Time (GMT, UTC+00:00) (also known as Western European Time) between October and March, and British Summer Time (BST, UTC+01:00) (also known as Western European Summer Time) for the rest of the year. BST applies from the last Sunday in March to the last Sunday in October.
Source: Wikipedia — Time in the United Kingdom (CC BY-SA 4.0)