The census appeared to confirm a boom in cycling in London, with 161,700, or 2.6% of the population, using this form of transport to get to work in the capital.
This compared with 77,000 a decade ago, the ONS said, but these figures were not strictly comparable as the 2001 figures did not include those people who said they worked from home.
Meanwhile 50%, or two million people, used public transport to get to work in London.
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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.