Syria was a key topic in talks between David Cameron and Mr Hollande at RAF Brize Norton in Oxfordshire. Mr Hollande said afterwards: “We have young people who live in our respective countries who are being manipulated, and they are going off to the combat areas. Today we were exchanging figures. I am not going to teach you anything but it is the same level: 600 to 700 young people are involved in each of our countries.”