Lloyd Scott has completed his charity climb up the Gherkin in a deep diving suit in a total time of 2 hours and 53 minutes.
He climbed 38 floors and a total of 1,037 steps in the 10 stone suit - and told ITV London how he felt at the top.
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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.