evidential

The senior Essex coroner, Lincoln Brookes, found "no evidential basis to consider this attack was possibly preventable so many years and imponderables later".

However, last month the director of public prosecutions said "the case could no longer proceed to trial since the evidence no longer met the evidential test".

In his latest letter, sent to MPs, he said he was taking the "unusual" step of sharing more details because "government briefings have been provided commenting on the evidential situation".

However, last month the director of public prosecutions, Stephen Parkinson, who leads the CPS, said "the case could no longer proceed to trial since the evidence no longer met the evidential test".

Mr Cameron further told the hearing he anticipated "four to five weeks for the evidential hearings."