Britain and many other European countries have contributed greatly to this campaign. At least five hundred UK fighters are now boots on the ground in ths campaign.
The cost of educating, housing, giving NHS medical care and benefits to some of that group is probably very high indeed so the UK has already spent a lot of money gearing up for this conflict. I just thinks it's lucky that some of them are now finding out first hand what their hard earned taxes have been used for by the MOD
Where Britain is failing IMHO is trying to react to ISIS exactly how ISIS want us to by treating this conflict as a 'police action' where minimal force is the prime mover.
Brimstone looks sexy on TV news clips taking out ONE vehicle. A MOAB elsewhere could be dropped almost at random and create a much higher casualty rate and instill more fear than a little pop gun missile designed to leave bystanders alive and well.