An alleged victim of Rolf Harris, who was found guilty of all 12 charges of indecently assaulting four girls in the Sixties, Seventies and Eighties yesterday, wrote to the Queen to warn her of his predatory behaviour.

The woman sent a letter claiming that the veteran TV presenter, 84, had attacked her as a child to Buckingham Palace in 2005 as he painted the monarch’s portrait.

“He ruined my life. You need to know what kind of man you’ve let near the Queen,” she wrote to royal staff.

The notes, which remained anonymous, were handed to Scotland Yard’s Royal Protection Group, who certified their credibility and filed them as evidence.

However, they remained uninvestigated until Harris became an official suspect in 2012.

Scotland Yard have thus far declined to comment on the letters.

Rolf Harris: A life in pictures Show all 20 1 /20 Rolf Harris: A life in pictures Rolf Harris: A life in pictures Rolf Harris Rolf Harris in 'Stars on Sunday' TV Programme (1969 -1979) Rolf Harris: A life in pictures Rolf Harris Rolf Harris and his daughter painting a wall together, 1967 Rolf Harris: A life in pictures Rolf Harris Rolf Harris on the 'Rolf Harris Show', 1973 Rolf Harris: A life in pictures Rolf Harris Rolf Harris in 1968 Rolf Harris: A life in pictures Rolf Harris Rolf Harris smiles during the 'The Rolf Harris Show' in 1973 Rolf Harris: A life in pictures Rolf Harris Rolf Harris with art book he wrote for children in London, 1978 Rolf Harris: A life in pictures Rolf Harris Australian entertainer Rolf Harris gets ready to blow his didgeridoo to promote a concert at Central Hall, Westminster, staged to raise money for research into cancer in children at the Royal Marsden Hospital. Keystone/Getty Images Rolf Harris: A life in pictures Rolf Harris Rolf Harris sketches a picture of Bambi, 1986 Rolf Harris: A life in pictures Rolf Harris Rolf Harris painting in the style of Gauguin bbc Rolf Harris: A life in pictures Rolf Harris Rolf Harris and his wife at the David Frost's Society Party in London, 2001 Rolf Harris: A life in pictures Rolf Harris Rolf Harris performing at Glastonbury 2010 Getty Images Rolf Harris: A life in pictures Rolf Harris Rolf Harris performs in 'The Rolf Harris Show' in 1973 Rolf Harris: A life in pictures Rolf Harris "Rolf Harris" book signing in London, 2010 Rolf Harris: A life in pictures Rolf Harris Rolf Harris with his portrait of the Queen at a London art gallery in 2010 Getty Images Rolf Harris: A life in pictures Rolf Harris Rolf Harris at the Daily Mirror's Pride Of Britain Awards 2012 in London Rolf Harris: A life in pictures Rolf Harris Rolf Harris and his wife Alwen attend the Press & VIP preview at The Chelsea Flower Show at Royal Hospital Chelsea in London, 2010 Getty Images Rolf Harris: A life in pictures Rolf Harris Rolf Harris surrounded by media leaves City of Westminster Magistrates Courts in London, 2013 Rolf Harris: A life in pictures Rolf Harris Entertainer Rolf Harris and his wife Alwen Hughes (L) arrive at Southwark Crown Court in central London, 6 May, 2014 Reuters Rolf Harris: A life in pictures Rolf Harris Rolf Harris is surrounded by members of the media as he leaves Westminster Magistrates Court, in central London, 2013 Rolf Harris: A life in pictures Rolf Harris Rolf Harris arrives at Southwark Crown Court in London, 27 June 2014

The oil painting, titled "Her Majesty Queen Elizabeth II – An 80th Birthday Present", took Harris two months to complete and was based on two sittings with the Queen in 2005.

Its creation was the subject of a BBC TV programme, and it hung in the palace until 2007, before being returned to the BBC. It was loaned to the Walker Art Gallery in Liverpool in 2012.

Asked where the portrait is now, a BBC spokesperson said: "We've been asked about this before and the position hasn't changed. The BBC does not have this painting in its collection."

Video: Harris thought he was 'above the law'

West London Mental Health confirmed to Sky News that Harris was among the famous faces who were invited to visit the facility by Savile, but did not provide any further details.

Officers from Operation Yewtree, the national inquiry set up in the wake of the Jimmy Savile scandal, said they will continue to investigate allegations.

It has since emerged that a further 13 women had contacted children’s charity the NSPCC claiming that they were also abused by Harris, who at the time was a campaigner for child safety. The entertainer even featured in a child prevention video Kids Can Say No in the Eighties, which ended with a song called "My Body".

It included the lyrics: "My body’s nobody’s body but mine, you run your own body, let me run mine."

Peter Wanless, chief executive of the NSPCC, told ITV's Good Morning Britain that his decision to star in the video had shown his “absolute hypocrisy”.

“I think what happened was that he commissioned an independent film company to make this video and then they asked us about the accuracy of the safety messages within the video,” he said.