The woman was getting off the train on May 23 at around 4.30pm, when she was reportedly sexually assaulted.

According to the British Transport Police (BTP), the incident occurred on the line between Victoria and King's Cross station.

CCTV images of a man have been released who police believe could help with their investigation.

Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 425 of 23 May.

Alternatively, contact Crimestoppers anonymously on 0800 555 111.

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