On Wednesday, a few hours after the horrific knife attack on two British Jewish men in Golders Green, north London, a video appeared on Telegram apparently from the group - called Harakat Ashab al-Yamin al-Islamiya (HAYI) - making an unsubstantiated claim of responsibility. It follows a string of arson attacks around Europe that have been claimed by the group, whose name translates as the Islamic Movement of the Companions of the Right. But, unlike some of the previous claims that appeared to show footage taken by the perpetrators, Wednesday’s video used footage that was already in the public domain. Experts think that HAYI, or people using their branding, are opportunistically claiming the terror attack that saw two men, aged 76 and 34, stabbed. The Metropolitan Police has said that the suspect in the Golders Green attack is a 45-year-old British national who came to the UK from Somalia as a child, and who has a history of serious violence and mental health issues.…