There's no way the UK government will go to war against ISIS after the disasters in Iraq and Afghanistan.
You have to wonder where it will all lead though. One big hurrah from ISIS might force the governments hand but it would have to be on home soil for them to react. 30 odd Brits in Tunisia isn't enough.
I fear they will simply rampage across the Middle East for a good few years yet until they burn themselves out. What are Al Quaeda up to at the moment? Burned out or biding their time?
The world is not going to become a safer place, that's for sure.