- The attack happened around 8am on Friday the 27th September
- The man is described as black and of scruffy appearance
- He was wearing a grey hooded jumper with the hood worn up
More top news
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.