Victims of Scotland Yard’s botched inquiry into a fictitious Westminster paedophile ring have called on Labour’s deputy leader to resign before the publication of a damning report.

Tom Watson is “unfit to hold the office of MP”, according to the widow of Lord Brittan of Spennithorne, the former Tory home secretary who died before the child sex claims against him were proved to be false.

Lady Brittan has read the full report on the case by Sir Richard Henriques, a retired High Court judge. A friend of the peer’s widow told The Times: “The extent of Tom Watson’s involvement in the witch-hunt of innocent people has been laid bare. His subsequent attempts to distance himself show a complete lack of integrity. By misusing his