The Walk-In Season 2 is yet to be announced by ITV1

Robbie Mullen's performance on the witness stand will prove to be the key factor in any successful guilty convictions of his former National Action friends.

With a trial date set for the members of National Action, Matthew Collins tries to keep Robbie Mullen safe but he puts his own family in harm's way in doing so.

Refusing to enter witness protection after helping the police to arrest National Action members, Robbie Mullen trusts that Matthew Collins and Hope Not Hate will keep him safe.

National Action insider Robbie Mullen reaches out to Matthew Collins and Hope Not Hate to try to prevent the murder of another MP, but he puts himself in danger in doing so.

With terrorist attacks in Britain causing political unrest across the country, Matthew Collins and Hope Not Hate fear a violent, racist reaction from the British far-right.