Dr Julian Lewis: No coherent military strategy against Daesh/ISIL in Syria can be formulated unless and until the Government face up to the unpleasant fact that they will have to co-ordinate their efforts with those of Russia. Would a useful first step be co-operation between the Russian security services and ours in this field, despite our reservations and concern about Russia’s behaviour in other parts of Europe?

[The Secretary of State for the Home Department (Mrs Theresa May): Of course, talks have been taking place in the G20 with a number of international leaders about Syria, what action needs to be taken about it, and its future governance. Obviously, I look forward to the outcome of those talks. It is important to ensure that every effort is made to bring about a resolution to the conflict in Syria, not only because of the impact that that could have on ISIL, but because of the many millions of Syrians who have been displaced from their homes as a result of the conflict.]