Jonathan Ross and Russell Brand's lewd calls to actor Andrew Sachs were a "deplorable intrusion with no editorial justification", the BBC Trust has said.

Chairman Sir Michael Lyons supported Ross's 12-week suspension, adding that no further action would be taken.

He said the furore could have been avoided if BBC management had followed the corporation's editorial guidelines.

It was "not rocket science" to have expected a show featuring Ross and Brand to cause trouble, he added.

The trust, which acts as the BBC's watchdog, said a list of high-risk radio programmes should be put together to help prevent a repeat of the incident, broadcast on Radio 2 on 18 October.

It recommended tougher penalties for staff who do not comply with editorial guidelines, and that there should be tighter controls on shows made by companies owned by their performers. Brand's show was made by his own firm.