But the trial will not be straightforward and may not even lead to an appropriate sentence if Janner is found guilty.
He is likely to be found "unfit to plead and therefore not fit to instruct his legal team and not fit to challenge or give evidence in a trial. Therefore the most likely outcome of a “trial of the facts” would be an absolute discharge, which is neither punishment nor conviction." But with each time delay that outcome became more likely.
One outcome if the trial concludes he is guilty surely must be the removal of his title as in the case of Sir Jimmy Savile and others.
In April Saunders was strongly advised to authorise the prosecution of Janner but ignored requests including those from alleged victims.
The case against Janner will commence August 7 with a hearing at Westminster magistrates court.
The trial will cover 22 offences allegedly committed in the 1960s, 70s and 80s.
The Director of public prosecutions, Alison Saunders, decision not to prosecute Janner has led to calls for her to resign following today's U Turn.
Saunders is the first DPP to have a major decision reviewed and overturned but it is not the first time her decisions have been criticised.
Speaking on Channel 4's evening news program Saunders explained her position defending other decisions she has made that have not been universally approved.
But perhaps a Guardian editorial hits the nail on the head in a piece titled "The Guardian view on Alison Saunders: don’t sack her, back her" which rightly points out "The child abuse allegations against Lord Janner should have been prosecuted a decade ago. It’s too late now." While that may be true what about the victims?
The allegations against Janner have been part of three failed police prosecutions says the Guardian, but this is the first time they have been heard in a court of law.
In 2014 it was revealed that police had compiled a dossier holding more than 20 allegations against Janner; it was also revealed that a police officer was ordered not to search Janner's home. In a statement in April Director of Public Prosecutions Alison Saunders said there was enough evidence to charge Janner with:
June 29 an updated statement on the CPS website begins:
The Director of Public Prosecutions (DPP) Alison Saunders will now bring criminal proceedings against Greville Janner for child sex offences.