Well finally got my replacement card after UPS tried to deliver it 20 doors up from mine. Apparently they have no means of checking postcodes from their vans. UPS...GPS...one letter short I guess.
So, not a GTX260, but still pulls out about 3000 points more in 3dmark06 than the 8800GTX. And it works, which is the all important part.
Ah, every thing's back to normal. Time to get cracking in Fallout3 and Farcry 2 again