If the vote in the Commons is for extended air strikes to Syria, I feel it's almost inevitable that there will be some level of mission creep. There almost has to be -- as others have opined, it's not going to be enough to rely on airstrikes if we want to do anything other than contain ISIS on the ground. What we've seen in Iraw is that airstrikes are only effective if coordinated with a larger-scale military action involving conventional army forces.
Preferably such a force should be made of locals wherever possible. In the long run, though, the way to defeat ISIS -- and, far more importantly, to solve the problems that led to their rise in the first place -- will require a sustained global effort, focusing not just on Syria and the Middle East but in places such as Libya, too, where ISIS-related forces are on the rise.
A vote for Syrian airstrikes, anyway, ought to be made only in full expectation of where it will have to lead. More action, more involvement. And, sadly, more bloodshed. This, anyway, is the vote I went for.