Yvette Fielding says she was assaulted by Rolf Harris on Blue Peter and left alone with Jimmy Savile

Blue Peter's youngest ever presenter has claimed disgraced entertainer Rolf Harris sexually assaulted her when she was a teenage host of the children's show.

Yvette Fielding, who joined the long-running BBC programme aged 18, told the Sun newspaper how the paedophile predator squeezed and patted her bottom after finding herself alone with him in a TV studio.

The now 55-year-old also recalled an uncomfortable experience with "grotesque" Jimmy Savile, who was later revealed to be one of Britain's most prolific sex offenders.

Fielding has questioned the role of the BBC in allowing their behaviour, arguing people in the industry "must have known".

She became a Blue Peter presenter in 1987 and left five years later, going on to host a string of BBC programmes including The Heaven And Earth Show, The General and City Hospital.

Recounting the incident with Harris, she said: "It was very confusing and shocking - just bizarre to think Rolf Harris was squeezing and patting my bottom and I am standing there, thinking 'I don't know what to do'.

"Other people in the industry must have known what he was like and you left me alone in the studio with him.

"That shouldn't have happened. I must have been 18 or 19.

"I think a lot of them did know."

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Harris was a household favourite for decades before his dramatic downfall after being convicted of a string of indecent assaults against young girls.

Stripped of his honours, he died of neck cancer and old age in May last year, aged 93.

He was also known to be associated with Savile, who managed to conceal his crimes until after his death in 2011.

On her meeting with the late depraved DJ, Fielding told the Sun: "He took my hand and started stroking it. 'Look into my eyes', he said, 'And tell me what you're thinking'."

"He was grotesque," she added.

"I just don't understand why the BBC allowed him to get away with that for as long as he did."

Savile worked for much of his career at the BBC presenting programmes including Top Of The Pops and Jim'll Fix It.

The BBC has been contacted for comment.