- The man is described as black with a scruffy appearance
- He was wearing a grey hooded jumper with the hood worn up
- Police are appealing to anyone who recognises the man to contact them on 020 7601 2222
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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.