Stuart
I don't think there is a shortage of 10Ds in the USA, and if you go to the FredMiranda or PhotoNet or even the NaturePhotographer web sites (the Classifieds or Buy/Sell sections), you will find someone advertising to sell a mint or like-new condition 10D. With the US dollar as weak as it is, you won't be able to get it any cheaper in the UK anyway.
If you can wait, it's probably best to wait, as Canon has no choice but to drop the price of the 10D and/or replace it with a newer version with a higher spec, as the Nikon D100 is causing some serious competition. I understand the Pentax *istD and Olympus E-1 have already dropped their prices. Canon has to follow suit, and it should happen before and certainly no later than Photokina in October.
But if you do not wish to wait, then maybe you should look for a lightly used one from the above-mentioned photo sites ... or eBay ... but be very wary of eBay sellers, as most scammers operate there!
Bobby