A jury has retired to consider its verdict in the case of a man accused of supplying a gun to Mark Duggan, shortly before Mr Duggan was shot dead by police, triggering last summer's riots.
Kevin Hutchinson-Foster, 30, has admitted to a jury at Snaresbrook Crown Court that he borrowed an illegal firearm. But he claims he gave it back a week before Mr Duggan was shot.
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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.