Today marks the first day of a four-day inquest into the suspected friendly fire death of 26 year old Sapper Mark Antony Smith from Swanley in Kent.
He is thought to have died in an explosion in Afghanistan after a shell landed short of its target.
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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.