A far-right extremist who plotted to murder a British politician has been jailed. Jack Renshaw, 23, planned to kill opposition Labour Party MP Rosie Cooper with a sword. He was sentenced to life at London's Old Bailey and ordered to serve a minimum of 20 years before he will be considered for release. Renshaw, who was a member of the now-banned far-right group National Action, planned to murder Ms Cooper after he was arrested on suspicion of child sex offences last year. He told other members of the group that he had been set up by the police and sought their permission to take revenge on the officer who had arrested him as well as his local MP. In court, Mrs Justice McGowan told him: "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." As part of his plot to kill Ms Cooper, he purchased a sword online and carried out internet searches on how to cut the jugular artery. He was apprehended before the plot was carried out when a member of the group reported him to anti-extremist group, Hope Not Hate. "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," Ms Cooper said. "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 was convicted of the child grooming offences last year and was already serving a 16-month sentence when the case took place on Friday. Renshaw was previously a member of the far-right British National Party's youth wing.