At just after 6am on Tuesday, the 28th of April, a man boarded a train at London Bridge railway station towards East Croydon and followed a woman, choosing to sit close to her despite many other seats being available.

He then exposed himself to her and began to touch himself inappropriately.

Detectives believe the man in the image may have information that could help their investigation.

Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 85 of 28 April.

Information can also be given anonymously to Crimestoppers on 0800 555 111.