I can assure my hon. Friend that there is no doubt about that: the commitment of all the 28 members of NATO to article 5 is absolute. This is a treaty obligation, and this is something they all take very seriously, but to show, through our exercises, our deployments and our planning for the future, just how seriously we take it could very much be something to which the NATO summit turns its attention. That is not just up to us; it is up to all our colleagues in NATO, but I think that, in that sense, my hon. Friend makes a very good point.