THE full story behind the arrest of far-right extremist Jack Renshaw following a plot to murder Labour MP Rosie Cooper has been revealed.

Campaign group Hope Not Hate released a video online on Tuesday featuring an interview with the whistleblower who raised the alarm on Renshaw's intent to commit murder.

The plan was foiled by Robbie Mullen, who leaked details of a meeting at the Friar Penketh pub in Warrington to Hope Not Hate in July of 2017.

Jack Renshaw, 23, from Skelmersdale, Lancashire, pleaded guilty to preparing to engage in an act of terrorism in relation to the plot and threatening a police officer.

He had previously been convicted of stirring up racial hatred in speeches in 2016.

READ MORE: Neo-Nazi National Action leader jailed for eight years

The video was released following a trial at the Old Bailey which sought to determine if Renshaw had been a member of the banned group National Action.

Following a seven-week retrial, the jury was unable to reach a unanimous or majority verdict.

However, it can now be reported for the first time that Renshaw was last year convicted of grooming two adolescent boys online for sex.