A former prisoner has given an account of how he came to join a group of prisoners at HMP Woodhill, Milton Keynes, who pledged allegiance to Isis

In a prison cell at HMP Woodhill, the walls of which were lined with religious posters and family photographs, Brusthom Ziamani, 24, a jailed terrorist, and another prisoner, a convicted murderer, sat with two young inmates.

Another man, then aged 24 and who will be referred to by the pseudonym Jack, arrived at the door and squeezed into the cramped room.

The murderer, a broad, muscular man we have called M, greeted Jack with a bear hug and instructed him to stand beside Ziamani.

Brusthom Ziamani is said to have taken it upon himself to police the jail for Ramadan rule-breakers METROPOLITAN POLICE/PA

These three converts to a warped and extremist brand of Islam had formed a self-styled Sharia court to sit in judgment on the two other prisoners sitting cross-legged on the floor.

The accused were made to stand and announce their names