Counter-Terrorism and Security Bill

My Lords, I want to ask a rather practical question. The whole of Clause 2, together with the amendments, appears to deal with someone over whom the Government assume there will be some degree of control. I take the example of someone who has gone to Syria and comes back through Syria to the airport in Istanbul. He then seeks to fly back to England and is made the subject of a temporary exclusion order. What is to happen to that person in Istanbul? What are the Government of Turkey to do with this person? If you stop them at an airport outside the United Kingdom, is there not a very real danger that they will just go back into Syria or into Iraq? What I have not understood about this temporary exclusion order is what will happen to these people who are not able to come back to this country.