I'm interested! If we reach an agreement I would be happy to pay with BTC.
I can get them here in New Zealand for NZD$202.96 including tax (
http://goo.gl/BDQQR) ; that's $811.85 for four, with a one-year warranty.
At current exchange rate, that's four new cards for 405.38 GBP.
Can you make me an offer (including fairly speedy shipping to New Zealand -- so I can begin before the difficulty gets INSANE) which will make me not worry about the inability to claim warranty?
Aside from it arguably being silly to them halfway around the planet when it's possible your next-door neighbour wants them, I note after a quick price aggregator search that the UK retail prices for these are quite high, so I understand if you want to hold out for a better price.
Let me know