Amazon US have the 5 disc HD DVD collection of blade runner for $27.95, including standard international shipping it works out at $34.43 which is about £16.72 in sterling, which is also under the £18 import tax threshold. The cheapest place i found the 2 disc collection is £17,99 at play.com, so it's a bit of a bargain! They do estimate that you should receive it between the 2nd and 8th of January 08' so a little bit of a wait, but still a bargain price.
Also available on Blu ray for the same price:http://www.amazon.com/Runner-Five-Disc-Complete-Collectors-Blu-ray/dp/B000UBMWG4/ref=pd_bbs_sr_4?ie=UTF8&s=dvd&qid=1196804474&sr=8-4
Sorry should haver said that both the HD DVD and Blu Ray are region free :o)