Ian, I've imported rifles from the States with no problems, only trouble is the VAT and Duty, plus handling fees, plus the exporters fees etc and postage. I'd be more than happy to help if you see something, but them added costs could go towards something in the UK.......
Have a look on egun, I've just imported an L42 from Europe (big thanks to Promo) and it was delivered straight to the door. Nothing to pay, if it had of been from the USAthen I would be looking at around £2000 plus the cost of the rifle.