Yeah, Im finding this to be a real pain myself. Currently waiting on an iBook (to the value of $350 or £190) and ive been researching this myself. If it gets shipped USPS (US version of royal mail) it will get transfered to ParcelForce Worldwide when it enters this country, now, depending on the value will depend on if you have to pay import tax. ParcelForce will pay this for you automatically, however, before they will deliver your item you will receive a letter saying you owe ParcelForce X Number of pounds. Exactly how much I am unsure of as I am yet to receive my iBook or a letter from ParcelForce.