The world watched on television as flames tore through Windsor Castle's fortress, parts of which are almost 1,000 years old.
Priceless artwork was at risk and so were stately rooms, some of those were destroyed and a large restoration project followed.
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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.