Police have issued a second appeal for information after a young woman was subjected to a prolonged sexual assault on her way to work on a packed Central Line train.

British Transport Police (BTP) issued an image of a man they wish to speak to in connection with the assault - a man they now believe boarded the train at Ilford.

Detective Sergeant Thanh Ly said: ”I have issued the image of a man again in the hope someone recognises him. Since our first appeal, I have received information to suggest he boarded the train that morning at Ilford.

The 20-year-old victim from Romford spoke to the Recorder about her ordeal two weeks ago.

The assault happened after she boarded her regular westbound Central Line train at Liverpool Street at 8.30am on October 15.

“Where I was standing I couldn’t move,” she said. “I was against the doors – blocked in.

“He was standing that close I couldn’t look up or move my head. When I did get a chance I realised he didn’t need to be that close.

“I could feel him touching me but thought he was doing it by accident, because why would someone do that? I was very confused.

“I looked at him as if to say ‘what are you doing?’ and he tried to put his hand on the inside of my coat down the back of my trousers.”

The train then stopped at Holborn, where the man left.

“I realised what had happened and burst into tears,” she said. “I rang my mum straight away at Oxford Circus.”

After reporting it, she did not go to work that day or the following two because she felt “uncomfortable” on the Tube.

“I still do but I don’t have a choice, if I did I wouldn’t use it,” she explained.

“People have to be really aware of who’s around. I feel violated, it was really horrible.”

She is now calling for cameras to be installed on the busy Central Line trains.

Det Sgt Thanh Ly, leading the investigation, said: “This was an incredibly-distressing experience for the victim. I am determined to catch the man responsible.”

Anyone with information should call British Transport Police on 0800 405 040, or text 61016, quoting reference TSUB/B19 of 22/10/2014. Information can also be passed anonymously to Crimestoppers on 0800 555 111.