People who are interested in this issue should read the report of the defence working group, of which I was a member. I argued strongly against the idea of a mutual defence agreement, where each country would have an obligation to respond in the event of an outside attack on a member state. I argued it from a pragmatic point of view. I believe it will not carry. There are other arguments for and against it, but I believe we are sidelining a range of other issues by getting too deeply involved in a debate about something which is unlikely ever to happen.