Jill Huish, who runs the campaign that Mary backed, said: “It shows how deep austerity is cutting our most vulnerable when even David Cameron ’s mum has had enough.”

Mary, 81, signed a petition railing against Conservative cuts to “essential services”.

She put her name to the battle to save dozens of children’s centres that a Tory-run council is poised to close to save £8million.

Local authorities in England have had their government funding slashed by 40% since Mr Cameron entered Downing Street in 2010.””