Defending the group's proscription under terror law, she said the organisation was "not a non-violent organisation".

It was no ordinary break-in. On June 20, under the cover of darkness, two activists entered what should have been one of Britain’s most secure military bases, RAF Brize Norton, and vandalised two Voyager planes.

The home secretary Yvette Cooper has faced intense criticism for choosing to proscribe PA, even from fellow Labour MPs like Clive Lewis, who warned the proscription “undermined democracy” and told parliament it risks “confusing dissent and terror”.