PC hardware - import taxes?

What's the offical line on importing hardware to the UK, from outside the EC of course. As in what taxes are applied?

I'm finding that a lot of what I'm after either doesn't exist here (after extensive searches online) or costs a whole heap more than it does in say the US.

Example - I'm wanting a server rack case with specific specs, or a desktop case with a windowed top - or even something like a torture rack case (though I'm worried it has no EM shielding, cause it's acrylic.) But aside from a couple of new additions, with little info about them (plus they don't fit my exact wants...and the manuf. websites don't list them!) at scan's site I can't even find decent server rack cases in UK stores.

(if I get a windowed desktop it'll be to add on some fancy thermaltake heatsink/fan art; if I find the right rack case then I'll just go for non-fancy-looking heatsinks/fans)

I've imported a lot of console games and other media, but can find no info on the costs for any computer hardware.

Just in case anyone has seen exactly what I'm after - what I'm looking for in the rack is at least 4U, preferably aluminum but the look isn't as important, extendedATX motherboard space, at least two outside 5.25 drive bays (better with 3), and at least 6 inner 3.5 drive bays, an easy-access cover and fittings! - no sliced fingers wanted, and space for at least 3 medium fans (more if only the two optical drive bays), and hotswap bays for the hard drives. NO PSU! They never come with the PSUs I'll be getting (for some reason server cases tend to come with dodgy-sounding PSU ratings) - and the weight is too much extra for delivery.

cheers for any links / info.

Yeah! Plus our broadband costs are atrocious too compared to other countries (the speeds aren't so hot either).

I'd forgot to put this in previously: what's the deal with non-ECC RAM? Usually for error-checking it's just the one extra chip on the stick; I'm finding gaming motherboards tend to be compatible with non-ECC only, but then for the more stable memory you end up with much slower rates like 400MHz (I want at least 800MHz with very fast latencies). I found some mention of faster server RAM, but again - only seems to be stocked in the far east (it's made by a far east company, but still...). There's searches that return specs on Kingston sticks that are ECC and 800MHz, at 1GB, but no place that sells them. ?!