I personally don't think UK knife laws are all that bad. You can carry a <= 3" blade, provided it folds. If it's non-folding, or if it's lockable, you count the full length. Most full-sized Leatherman blades are longer than this limit when unfolded and locked.

(You can carry bigger blades than this, provided they're legitimate to your work/activities and/or they're stored sensibly. If you're a tradesman with a multitool on his belt you're exceedingly unlikely to have any trouble. If you're at a football match, possession of a knife would be treated a lot more seriously)