A neonazi paedophile who plotted to kill a Labour MP was jailed for a minimum of 20 years today.

Jack Renshaw, 23, bought a 19-inch (48cm) Gladius knife to kill West Lancashire MP Rosie Cooper and exact revenge on a female police officer who was investigating him for child sex offences.

Renshaw, a supporter of banned terrorist group National Action, gave a nazi salute towards supporters as he was led from court at the Old Bailey.

The judge praised the two women targeted by Renshaw — Ms Cooper and Detective Constable Victoria Henderson — and told Renshaw: “You have not defeated them.”

Friends and family had encouraged Ms Cooper to stand down from Parliament but she refused because “that would allow tyranny to prevail.”

Renshaw’s plan was revealed to the anti-racist campaign group Hope Not Hate by Robbie Mullen, who was at a meeting in a pub where Renshaw announced his intentions in July 2017, one year after Labour MP Jo Cox was murdered in her constituency in Yorkshire by a far-right extremist.

Also at the meeting at the Friar Penketh pub, Warrington, was National Action leader Christopher Lythgoe.

In court Renshaw pleaded guilty to planning to carry out “an act of terror.”

The Crown Prosecution Service (CPS) said evidence included online research on cutting the jugular artery and how long it would take someone to die from the wound.

CPS head of counter terror Jenny Hopkins said: “Jack Renshaw was prepared to act on his white supremacist world view and plotted to kill a Member of Parliament — a plan reminiscent of the abhorrent murder of Jo Cox MP.”

Sentencing Renshaw, Mrs Justice McGowan said: “Your perverted view of history and current politics has caused you to believe it right to demonise groups simply because they are different from you.

“This is a case in which only a sentence of life imprisonment can meet the appalling seriousness of your offending.”

In a statement after the sentencing, Ms Cooper said: “My deepest wish is that this case is the last occasion when any public servant, any politician, has their life threatened for simply doing their job.

“I believe today justice has been served. Not for me personally, but for every MP and public servant, and for our democratic way of life which affords us the privilege of free speech, without fear of violent retribution.”

Renshaw previously received a three-year prison sentence when he was found guilty of stirring up racial hatred after he called for the genocide of Jewish people. He was sentenced to 16 months last year for grooming adolescent boys.

In a victim impact statement, Ms Cooper said it was “like something out of a horror movie.”