Clearly, we require, and we are looking to achieve, close co-operation with the European Union on security matters, but, again, these will be a matter for negotiation, and as the negotiations progress, we will keep the House informed.
The commitments that the Prime Minister and the Secretary of State have given are important. That is why the Government published the White Paper on our negotiating position last week, with an introduction by the Prime Minister, once again stating our clear aims for the negotiations. That includes, for example, the implementation phases referred to by hon. Member for Brighton, Pavilion (Caroline Lucas)—those are part of our objectives.