Disgraced Sydenham entertainer and TV artist Rolf Harris has reportedly been driving prison guards potty during his jail time by building didgeridoos out of toilet rolls in his cell.

The Australian-born 85-year-old is well known for his love of the Aboriginal wind instrument, and is said to have been crafting his own version using the cardboard from loo rolls and match sticks.

Prison guards have confiscated his musical creations multiple times, but Harris is determined to have his beloved instrument to hand and keeps rebuilding it from scratch, a source told the Sun.

MORE TOP STORIES MORE TOP STORIES

They said: “He joins the tubes together with matchsticks, it’s driving everyone mad.

“He sits in his cell and tries to play his home-made didgeridoo.

“It’s not the real deal but it acts as a therapy for him.

“And he continues to make them even though he keeps getting them confiscated.”

The animal hospital star is serving a six-year sentence at Stafford Prison for sex offences against four girls, one aged just seven or eight and will go on trial for further charges next year.