Just a quick FYI: the Spanish Amazon site opened a couple of weeks ago.
I haven't actually ordered anything through it yet, but the postage to the UK is a reasonable 6€. I'm adding the link to the DVD shop list in the column on the right and updating the resources post so that it's included -if you already have an Amazon UK account, you just enter your usual login. I've ordered things from Amazon France before without a problem and I doubt that this will be any different -but I'll post some sort of update when I have ordered something (how long it takes to arrive, etc.).