In terms of the law this is how i understand it in a nutshell (if i'm wrong someone please say)....
Uk law says you are aloud to carry a knife under 3.5 inches on you but that it is not aloud to be a fixed or locking blade (this may of changed recently) so a swiss army knife is fine.
If you do have a knife with a locking or fixed blade on you with any size blade you are only aloud to carry it with good reason.
So if your walking into Tesco with a machette strapped to your leg thats a no no, as you have no reason to have it....
If your on your way to or in the woods as long as you are using it sensibly and not threatening anyone or using it in a threatening way this is fine but this is one of the reason why i think alot of us try and do bushcraft away from populated area's where we will not bump into people. Seeing men dressed all in green with axes and knives is never a nice surprise for people unless your lost in the words and trying to find a meet....
Not quite right. An every-day-carry pocket knife has to have a cutting edge under 3", not 3.5. Obviously taking a knife to a nightclub is stupid regardless and could get you done. If you give your knife to a bouncer going into a club they're under no obligation to give it back, either. In the same vein, if you get in a fight while carrying a knife of any description you could get done for carrying an offensive weapon.
Also, 'on your way to' the woods is not an acceptable excuse for openly wearing a lock knife or fixed blade. You don't need it at that time, so you can't wear it. You can only transport it. Similarly common sense must be applied. Carrying a machete to work to open boxes of crisps is not a reasonable excuse.
Switch blades, flick knives, gravity knives, balisongs, all illegal to carry irrespective of the situation.
You'll get anomalies in some cases where a cop will be lenient, but you'll also get anomalies where a cop decides to hold you personally responsible for his ****ty day. So best to go by the letter.
More on topic, Rough Rider folders are great knives but all I've heard about their fixed blades is that they're rubbish, so I'd recommend the Mora too!
Pete
PS: Or, as Hoodoo said, the Enzo if you're willing to spend a bit more, they're awesome knives!