The killers of PC Andrew Harper had been set to partake in early release scheme as prison system on verge of collapse.

Downing Street said it was 'not possible' to exempt 'one or two offenders' convicted of manslaughter amid an outcry at the possibility of Jessie Cole and Albert Bowers being freed.

The Prime Minister is said to have been examining whether to exempt people who kill emergency service personnel from a controversial scheme to free up space in massively…