What my hon. Friend highlights is that this is not a new problem. We understand why it is so prominent right now in the press, but people have been going to join terrorist groups in Syria and Iraq for a number of years. He is right to point out that with the weakness of Daesh at the moment it is possible that more will seek to return. He asks me how many. We only have estimates. There is no accurate information, but as I mentioned earlier we think approximately 40% of the 900 who we estimate left the UK to join those groups have returned. In every case, we seek to manage that. He also asked me how many are under certain measures, such as TPIMs. That is not something that would be appropriate to discuss.