Police in Aberdeen have appealed for information to help find a convicted sex-offender Derek Robertson.

The 55-year-old was found guilty of indecent assault in 2003 and sentenced to four-and a half-years in prison.

In 2011, police launched a manhunt to trace Robertson after he failed to follow registration requirements.

In this latest appeal, officers said they believed the he had travelled by train from Aberdeen to London, via Edinburgh, and arrived at King’s Cross Station at 2:20pm on Tuesday, April 28.

They said he was last seen at Victoria Station in London at around 4pm on Thursday, April 30.

Detectives said Mr Robertson speaks with a Scottish accent and is white, 5’4” tall, with a large build and grey balding hair.

He was last seen wearing a black and white baseball cap, a short black jacket, white top with black sleeves, brown tracksuit bottoms and brown and red trainers.

Detective Inspector Barry Stewart, of Aberdeen Queen Street Police Station, said: "Members of the public are asked not to approach Mr Robertson, however Police Scotland would like to reassure people that considerate and extensive efforts are being put into locating him.

“Enquiries are currently focused in the London area and we are working with our colleagues from the Metropolitan police as part of this investigation."

Anyone with information on his whereabouts or sightings should contact Police Scotland on 101, quoting reference number 1374 of 30 April.

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Urgent appeal to trace convicted sex offender from Aberdeen