The GLA will hold its Annual Service of Remembrance for London's war dead in the Chamber at City Hall today.
Mayor of London Boris Johnson and Deputy Chair of the London Assembly, Darren Johnson AM, will be joined by Brigadier Richard Smith CBE, Deputy.
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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.