POLICE have released CCTV images of a man they want to speak to following a sexual assault on a Paddington to Oxford train.

British Transport Police said a 27-year-old woman was 'touched inappropriately' as she returned from the toilet on board the train February 28.

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The incident occurred at around 11.50pm while the train was travelling between Reading and Cholsey .

Officers believe the man got on the train after arriving at Reading following a service from Waterloo.

PC Stephanie Barras said: : “A 27-year-old woman was touched inappropriately by a man on the train as she returned from the toilet.

“She was shocked by the incident and told a friend what had happened.

“We have spoken to several witnesses to this incident, but we need the public’s help to find the person responsible.

“I am confident the man in the images we are issuing today has important information. Who is he?”

Anyone with information can contact British Transport Police on 0800 40 50 40.