Janner were reported to the Independent Inquiry into Child Sex Abuse after years of missed opportunities to prosecute him. When the allegations became public following a December 2013 investigation, Director of Public Prosecutions Alison Saunders originally decided that the peer should not be charged because he was suffering from dementia. This was overturned by an independent review and a so-called 'trial of the facts' was called - but the peer died before the proceedings could begin. In January a report by retired High Court Judge Sir Richard Henriques found that three previous chances had been missed to charge Lord Janner while he was alive: 1991: A complaint of sexual assaults by one individual who featured in the trial of paedophile care worker Frank Beck. The allegation, in essence,peer should not be charged, but this was overturned by an independent review. Now the allegations involving the former MP are being examined as part of the wide-ranging Independent Inquiry into Child Sexual Abuse, chaired by Justice Lowell Goddard (right)

The examination of claims linked to Lord Janner is one of 13 investigations launched by the inquiry, which is set to last for five years and has a budget of £17.9million for this financial year.

An overarching investigation will also look into allegations of child sexual abuse and exploitation involving people of public prominence associated with Westminster.

Mr Emmerson said: 'Allegations of the involvement of politicians in child sexual abuse are reported, on the one hand, as evidence of a paedophile conspiracy at the heart of Westminster and, on the other