Home Affairs committee chairman Keith Vaz described the loss of more than 100 official files relating to historic allegations of organised child abuse as being on an "industrial scale".
He told BBC Breakfast that he welcomed a letter from Mark Sedwill, the permanent secretary at the Home Office, outlining a a fresh review into the handling of the dossier.
We will want to pose further questions of course, because there's a lot of information that we didn't know was in existence that he's given us in this letter.
But also I think that the Government and Mr Sedwill should work with Parliament in fashioning a set of terms of reference that will satisfy all those who are dissatisfied with the way in which matters have been progressed so far - so I think it's an important step which we welcome.
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.