Stone Roses frontman Ian Brown has told a court that former TV weatherman Fred Talbot tried to sexually abuse his friend on a school trip to Scotland.
He said Mr Talbot had been his biology teacher in Manchester, and would organise trips for pupils.
Mr Brown told Lanark Sheriff Court of an incident on a camping trip somewhere in Scotland in late 1977 or early 1978.
Mr Talbot, 67, of Greater Manchester, denies assaulting several boys on school trips between 1978 and 1981.
The singer told the court that one of his school friends told him that Mr Talbot attempted to abuse him after inviting him into his tent.
The former TV weatherman faces eight charges of indecent assault between January 1978 and November 1981, as well as one charge of lewd, indecent and libidinous behaviour in February 1978.
Six of the incidents are alleged to have happened on camping excursions in Moffat in Dumfries and Galloway, and three on boating trips on the Caledonian Canal in Inverness.
Mr Talbot, best known for presenting the weather forecast on a floating map in Liverpool’s Albert Dock for ITV’s This Morning programme, denies all the charges against him.
The trial continues.