Terror suspects will go free in plea bargaining deal.

England is contemplating giving terror suspects immunity from prosecution if they testify against their fellow plotters under “plea bargaining” reforms being prepared.

The government wants to increase the number of convictions by giving extremists an incentive to cooperate with police. Sentence reductions could also be available to persuade terrorist detainees to reveal details of their plot.

The changes could allow terrorists involved in conspiracies to commit serious atrocities in Britain to escape justice and is likely to disturb some critics.

The aim is to expand the use of existing legal powers on “Queen’s evidence” deals – introduced six years ago for use in organised crime investigations – to terrorist cases.