not sure what the exact rules are in scotland, sometimes their laws are different to the english ones, but in england, you can carry a non-locking folding knife with a blade up to 3". however, when i'm out and about i carry a lock knife, because if you're out in the country then you have a reason for carrying a larger/locking knife. just remember to to take it to the nearest big city, telling a copper "sorry i forgot" won't cut much ice with them. try having a look at heinnie hayes , they have a section called "sheffield knives" got some sheepsfoot style etc. one of those might be worth a dig. hope that this helps
have a nice time when you do go
steve