I personally would never buy a marker from overseas.......
As Paul has already said, he won't entertain markers that were not purchased from the UK. If I were in his shoes, then I would have the same policy.
Accessories, like barrels, loaders, etc is fine though....... what can possibly go wrong with a barrel???
One of the guys on our team purchases quite a lot of stuff from the US. He's convinced he's saving money. How much is debateable, by the time you take out the hassle.
Last thing he bought was his Halo. Bought it for about £20 cheaper than over here, then Planet went and dropped the price on them. By the time he'd paid the duty on it, it worked out cheaper to buy it over here.