Kate Osamor wrote to a judge asking for leniency for her son

Kate Osamor is unfit to stay as an MP while questions about her knowledge of her son’s drug conviction remain, a former parliamentary standards committee chairman has said.

Ms Osamor, 50, resigned as shadow international development secretary on Saturday after it was revealed that she had known about the criminal charges against her son earlier than the Labour Party had claimed.

Ishmael Osamor, 29, was caught with drugs worth £2,500 at the Bestival music festival in Dorset last year. He pleaded guilty to possession with intent to supply cocaine, ecstasy, ketamine and cannabis in September and was given a community sentence of 200 hours of unpaid work. It was accepted that he had been looking after the drugs for friends.

Ishmael Osamor was caught with drugs worth £2,500 at a music festival HARINGEY COUNCIL/UNIVERSAL NEWS AND SPORT

Sir Alistair Graham, who was