The Queen and Members of Parliament will pay their respects today to the UK's war dead
Religious leaders and war veterans will also join them at the Cenotaph for a wreath-laying ceremony.
The service commemorates British and Commonwealth servicemen and women killed in world wars and other conflicts.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.