Shortly before 6pm on Wednesday 17 July, a man who was standing behind a woman on an escalator took out his phone and began taking pictures or recording up her skirt.
Officers believe the man in the image may have information which could help the investigation.
If you recognise him, or have any other information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 551 of 17 July.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
