How about staying at home and minding our own business!
We are a small bankrupt island off Europe, not the worlds policeman. Not even a community policeman or traffic Womble. Accepting it and moving on will probably defeat the root causes of terrorism a load more than the recruitment campaign for nutters that is Afghanistan/Iraq.
I cannot help feeling that some expeditionary exploits are in the long term national interest of the UK. The Falklands may turn out to be the most important.
Not so sure about Iraq, or even Iran.
Pakistan must stand up to its western neighbours. If it all goes wrong then heaven help them and India.