Police are appealing for witnesses after a woman was sexually assaulted in New Addington on New Years Eve.
The incident happened in Brierley, at about 4.30pm on December 31.
The man is described as wearing a balaclava, gloves, a black hoodie and black tracksuit bottoms.
It is believed he followed the woman from an alleyway in Brierley and may have been loitering around the area for some time before.
Anyone with information should contact DC Gray at Sutton police on 0208 721 4106, or Crimestoppers anonymously on 0800 555 111,