By UK Airpower,are you indicating attack assets alone or including SH as well?
In the case of attack assets I'm pretty sure that, at least in 'stan',the insurgents would love to see the back of the GR7/9's and AH64's.
The problem with insurgents is their ideals and commitment to their cause,although airpower is,in some cases, going to get you out of a sticky situation, it is a quick fix. In the long term they will regroup and keep coming back at you.