Revealed: The fates of the Britons who left to fight for the caliphate and how 450 of them have already returned to the UK

Shamima Begum is among the estimated 900 Britons who travelled from the UK to join the murderous Islamic State – and now she wants to come back and have her baby on the NHS.

Terrifyingly, as their caliphate crumbles, at least 260 of them are still unaccounted for including dozens of jihadi brides.

The biggest nightmare for the security services is trying to keep tabs on battle-hardened maniacs.