The main issue in the UK is availability, and this drives up the cost of dual-GPU cards to uneconomic levels. If you can find me a card with good availability in the UK, plus a price close to the prices you pay in the USA, then I'll agree with you about the 5970s.
My point wasn't that you must use 5970 just pointing out his claim that 5970s are for idiots w/ money to burn are off base. The claim one can build a faster rig at 1/3rd the cost is also off base (outside of the UK). For those who have access (and there is a never ending supply of used ones on ebay) they are efficient, cheap, and very dense (2.3 GH in 6 slots w/o extenders).
Remember that if we import from you, we get import duty and then 20% VAT bunged on top of the cost of the card, delivery AND duty.
What about used? Is there still a 20% VAT and import duty?
What if it was shipped as "non-functional" or "damaged" computer components?
Being serious because if there is any ways around the 20% VAT & import duty I think there would be a way to circumvent the British blockade. If the import duty and VAT is ironclad well I agree 5970s simply don't make sense in the UK.
It sucks when governments restrict free trade.