HS,
I don't believe that's right. I think parliament voted against state on state conflict with Syria and is more than happy fighting IS, as it happens limiting the area of ops for the considerable UK land based involvement to Iraq. A border that the enemy doesn't recognise incidentally.
I agree it's a big deal. It's a big deal because somebody somewhere must have done the staff work to ensure that our boys were legally protected and key allies supported in a fight against what is probably the greatest evil of our time. Somebody somewhere authorised it. BZ to anyone who had anything to do with enabling our boys and girls on exchange duties to get in the fight alongside coalition and UK assets - and most importantly, whoever the hell you guys down range and in harm's way are, Godspeed, good hunting.