I must admit, I dont understand some peoples posts, inform the OP of his options by all means, but some people seem to take it personally if the OP doesnt go with their suggestion, like theyre intent on convincing OP to change their mind, I had this on a thread of mine recently, I clearly stated in OP that Ive had ATi card 4 times in row and wanted to try NV, I dont care about best deal or price/performance I just want what I want and still people try to talk me into buying ATi, whats it matter to anyone else? In my instance I was asking if there were any more custom 570s due soon, as no one seemed to know they all tried to convince me to get ATi instead, in this instance its been pointed out to OP the relative performance of 570 to 6950/6970 and he has explained his reasons for wanting 570 still (his main game being Dirt) and still people are trying to talk him out of it, I guess its some form of purchase justification, if you can make everyone buy the same as you you feel better about your own purchase???
/end rant
To OP, another option for you to look at would be the Gigabyte 560SOC, cheaper than a 570 with very similar performance (not sure about exact performance in Dirt, you may want to check) and Gigabyte do have UK RMA, obv the 570 could be clocked too but out the box performance theyre similar