THE Bill's new commander helped nick a serial sex pest in real life - after he harassed her on a train.

Actress Julie Graham, who plays Lisa Kennedy in the ITV1 show, was STALKED by pervert Frank Olalaye during the late-night journey.

He started by staring at her on the platform then sat opposite her in the carriage.

Then he tried talking to her several times so she moved to another carriage where there were other passengers. But Olalaye followed her, and ignored all her requests to leave her alone.

And when she finally got off the train he chased after her.

Julie, 44, who was on a 12.30am London to Brighton train after a night out with pals, said: "He was getting closer and I was starting to get worried.

"He got to within a couple of feet of me so I told him to back off."

The mum- of-two alerted station staff and Olalaye ran away.

They called the police, who arrested him a few minutes later. Last week Brighton Crown Court heard that Olalaye was BANNED from approaching lone women following two similar incidents.

He was also convicted of sexually assualting a barmaid in 2007.

The 35-year-old, from Greenwich, South-East London, admitted breaching the order, and was remanded in custody for sentencing on June 25.