Ed Miliband said there needs to be a "thorough and proper review" into the missing Westminster "paedophile dossier".
Speaking in Leeds ahead of the Tour de France, the Labour leader said that child protection experts should also "draw together all of the lessons" learnt over the last few years about child abuse.
The MP who raised the claims that a paedophile ring operated in Westminster during the 1980s said new allegations have now come to light.
Lord Brittan has defended his handling of a dossier alleging paedophile activity in Westminster when he was home secretary in the 1980s.
A 1980s dossier claiming paedophile activity at Westminster may have mysteriously gone missing but the questions still remain.