I have said it before and I will say it again: we on these Benches are unequivocal in our view that Shamima Begum should never be allowed to return to Britain. However, the noble Lord is right to note the increase in fighting in northern Syria. One of the issues this raises is that British-born Islamic State fighters and sympathisers may be freed and then attempt to make the journey back to Britain, potentially by small boat crossings. In the interests of the security of the British people, what are the Government doing to ensure that no one who has fought for or assisted a terrorist group in that region is able to return to Britain?