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Published on 23 Oct 2015
Every year, the Palace of Westminster Clockmakers, have the huge responsibility of changing the time on the Great Clock when British Summer Time (BST) finishes and Greenwich Mean Time (GMT) begins - and vice versa each spring.
The process involves careful precision and split-second timing from the clockmakers. As well as re-setting the time, it gives them an opportunity to make close inspection of the clock mechanism as part of a rolling maintenance programme.
In addition to ensuring the most famous clock in the world is correctly re-set, the clockmakers have 2000 other clocks throughout the Palace of Westminster and the parliamentary buildings to adjust over time change weekend.