I think you'll find it'll be more difficult than you imagine, and there'll be a hell of a cost in British troop's lives. Why is it only the West who are ever held responsible for their actions? What about Saudi Arabia exporting Wahabism around the world, what about all the Muslim countries who let thousands of their citizens go to Iraq for jihad against America?
Why is it the wests problem?
Because we went in and destroyed the Iraq military and killed sadam paving the way for a weak government to get toppled by these scum.
Because we went in a destroyed the Libyan military and killed gadafi, now Libya has 2 factions of 'government' battling to take control meanwhile Isis setup in Libya.
Because we armed the Rebels battling Assad, most of which were the people that are now fighting for isis.
We never had a problem 'risking our peoples lives' on these stupid political decisions.
The Middle East has a lot to answer for, you are correct and countries like Saudi should play a bigger part, but fact is, it is 100% our fault that this situation is happening right now.
I appreciate it wouldn't be easy to eradicate them fully but the wests military power could put an end to this in a fortnight if they wanted to.