Get ready to turn your clocks forward... but before that expect things to get much darker

People around the world are marking Earth Hour this evening. People in Britain are expected to join in at 8.30pm... and then they will switch their clocks forward tonight as British Summer Time begins.

People around the world are marking Earth Hour this evening. People in Britain are expected to join in at 8.30pm... and then they will switch their clocks forward tonight as British Summer Time begins.

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THE nation will set their clocks forward by one hour this evening as we herald the start of British Summer Time... but tonight also sees the 10th year of Earth Hour.

Here is what we know about these events this evening.