A woman woke up to find a man kissing her with his hands down the back of her trousers while on a train. 

British Transport Police officers have issued two CCTV pictures in an effort to find a man they want to talk to, following a sexual assault on a woman onboard a train  shortly before Christmas.

In the early hours of December 14 the 25-year-old woman was travelling between London Victoria and Merstham when the incident happened.

Detective Constable Helen Magill said: “The victim was sitting next to a man on the train as it headed out of London.

“She spoke to the man, before falling asleep. A short time later, the woman woke to find the man kissing her, with his hand down the back of her trousers.

“The victim stood up quickly and moved to another seat.

“Do you know the man in the photos we have released today? This was a Saturday night-Sunday morning, 11 days before Christmas. Perhaps you were on that train, the 12.14am from London Victoria to Three Bridges.

“If you saw what happened, or recognise the man in either of the two CCTV images, please contact BTP.”

Anyone with information on this incident should contact British Transport Police, on 0800 405040, quoting reference SSUB/B3 of 17 February 2015. You can also text BTP, on 61016. Information can be passed to independent Crimestoppers, on 0800 555111.