Edited sentence: Police have now launched a perjury investigation into the evidence given at the trial.The future of the party was thrown into doubt when the News of the World published, a transcript of a conversation allegedly between Tommy Sheridan, the party's founder, and former friend and comrade George McNeilage, in which Sheridan confesses not only to attending a swingers club in Manchester twice, but also admits that he did inform a NEC meeting of the SSP of the visits, contradicting his evidence at a previous libel trial