Locking knives in the UK are not illegal to own or carry but you must have a good reason to carry ie someone like a farmer, so for most of us, we cannot carry a locking knife in public places.
I believe all knives leaving the factory are priced the same to anywhere in the world but as an example CRK's coming to the UK are subject to shipping costs and then on arrival here the dealer has to pay 8% import tax and then on top of this 20% VAT ( another tax!! ) and just to add insult he has to pay a fee to the delivery company for collecting said taxes! This why all knives in the Uk seem expensive. Different countries have different import taxes.
These days importing any locking knives by an individual person into the UK is almost impossible as they will be confiscated on arrival, being classified as flick knives, although most of these locking folders are available from dealers. I would not run the risk of importing a expensive Sebenza to lose it at customs. Fixed blades do not have any problems.
We have our rules on knife carry as do most countries in the world and I believe certain States within the USA have different laws on knives ( I might need correcting on this )
Although we might only have one dealer here in the UK, he is able to get what customers want if they are prepared to wait.
Dickie