http://www.outdoorpros.com/Prod/Buck...m/11931/Cat/36
Have this as my bench sharpening kit (heres a pic) with its coarse, fine and wet stone super fine - it can take a terrible abused blade and turn it back into a useful working tool in minutes.
For in the pocket out and about I use a folding diamond sharpener similar to this one.
http://www.kaizenbonsai.com/shop/pro...18b1ffd9acfba0
As for a good knife under £100?
http://www.survival-school.org/Defau...&productid=175
Fallkniven F1. Its my next purchase after I borrowed one for a month whilst out and about and couldn't take my knives over seas in my hand luggage. Its able to cope easily with heavier tasks, but is versatile and able to cope with finer tasks too. The stainless trilaminate blade is awesome, absolutely awesome.