Hollie Booth, 13, who was injured in the Manchester bombing, performs with her dance group Rise on Britain’s Got Talent last night

The police and MI5 will be given tough new powers to fast-track terrorist suspects to justice before they have finalised their attack plans after security chiefs admitted that they need a “step change” to keep the public safe.

Documents leaked to The Sunday Times show that the security services will be able to step in and disrupt plots earlier after blunders left terrorists free to commit atrocities in Manchester, at London Bridge and at Westminster that cost a total of 35 lives.

Three of the five terrorists involved in the attacks were among 23,000 extremists on the radar of the security services but only one was under active investigation by MI5 when they struck.

In a move that will be controversial, the plan calls for