If you don't trust Point of View go for the BFG here:http://www.overclockers.co.uk/showproduct.php?prodid=GX-059-BG
You pay £187.99 instead of £158.61 and you get a bit more speed (675MHz vs 650MHz) and the peace of mind.
There's a review at overclockers.co.uk for the PoV card, saying it actually runs at 500MHz, not 650MHz as advertised. No idea if it's true.
Edit: I've also checked www.scan.co.uk, www.ebuyer.com but their prices are higher. Yeah, are there better sites in the UK?