Friends of Kimberly Fortier’s husband Stephen Quinn say there is “incontrovertible proof” that Mr Blunkett is not the father of her two-year-old son William.

Ms Fortier, who had a three-year affair with the divorced 57-year-old Sheffield Brightside MP, is currently pregnant with her second child and is due to give birth early next year. Lawyers for Ms Fortier, 44, are said to have been contacted by the Home Secretary, who reportedly wants DNA tests to prove whether he is the father of both William and the child she is carrying.

But friends of Mr Quinn described the apparent legal move as “fanciful” and one told the paper: “If he (Mr Blunkett) wishes to go to court with his claim over William, he is in for a very large shock. “We don’t know why he thinks he is William’s father, but he is wrong.”

Looks like a job for the CSA. Ooops, maybe not… Its a job for Fathers4Justice!