Thousands of IS registration forms detailing phone numbers and family contacts of 22,000 jihadis were handed to Sky News by a disillusioned convert to the group entrusted with keeping the organisation's core secrets on a memory stick that he rarely parted with. The forms identify nationals from the UK and fifty other countries who gave their personal information to IS. Only when the 23-question form was filled in were they allowed to join. Some names and their new IS names are well-known, such as Londoner Abdel Bary, better known in the UK as a rap artist. The key breakthrough is the revelation of the identities of previously unknown jihadis in the UK, across northern Europe, and in other countries. Knowledge of their whereabouts is crucial to breaking the organisation and preventing further terror attacks. The defector claimed that IS, the YPG (Kurdish militia), and Bashar al-Assad’s government work together against moderate Syrian opposition. For details of Britons in the IS files go to