Abu Abduallah al-Britani, who fled the UK for Syria earlier this year, made the horrific claim while ­admitting he was ready to die fighting for the Islamic State.

He told of his terror training and revealed his fitness regime to keep fit for battle. Chillingly, he even bragged that “wrist exercises” made it easier to cut off enemies’ heads.

Until now his only contact with the outside world has been warped comments online, where he has posted pictures of life as an insurgent.

But now he has stepped out of the shadows to speak to one of our men acting on a tip-off that al-Britani, 23, was communicating through an obscure messaging app.