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The jailed paedophile, who was caught up in a prison brawl last week, has been warned they could be smuggled out or used as prison currency.

Governors fear unscrupulous lags could take advantage of 84-year-old Harris who is in a vulnerable prisoners’ unit at Bullingdon jail in Oxfordshire.

A source said: “Rolf spends most of his time in his cell ­doodling.

“He is frail and cannot be given a job so he has long hours to while away.

“He draws everything from self-portraits to his cell mate and also his signature kangaroo.

“He says doing that helps him meditate and get some peace.

“If asked he gives them away as gifts.

“This has to stop. They can be used as currency inside, maybe to pay for ­contraband, or can be sent outside.”

Harris was caught doodling in the dock during his trial at Southwark Crown Court. The sketches were ­confiscated and destroyed.

In June he was found guilty of 12 charges of indecently assaulting four girls.

He was sentenced to five years and nine months in jail but on Friday his lawyers said they would be appealing his conviction.

Harris is being held in a self-­contained unit on E wing which has a high number of elderly ­prisoners.

Last week a fellow lag spat at him, it emerged yesterday.

A source said: “Rolf was greatly shocked by the abuse, even though he was not physically hurt.

“He had started to show signs of coming to terms with his sentence but this has set him back.

“He is still very troubled.”

The paedophile entertainer is ­sharing a cell with a long-term inmate.

The man, also a ­pensioner, is a prison orderly and has a job cleaning the wing.

Many on the unit are also sex offenders and are classed as vulnerable.

Harris is said to be “very withdrawn”.

The shamed entertainer will be ­offered a two-month sex offenders’ treatment plan which, if he completes it, could mean he would serve just a fraction of his sentence.

Harris, worth an estimated £11million, would also pocket £12 a week for taking part.

The course involves several six-hour sessions where sex offenders have to face up to their crimes and accept the damage they have caused victims.