You will see a lot of people recommend XFX due to their lifeime transferable warranty in various forums on the internet. However
XFX only offers a lifetime transferable warranty to residents of the USA and Canada.
When it comes to other countries, such as the UK, XFX offers practically no warranty what-so-ever. Most retailers that sell XFX products, such as
Scan take it upon themselves to offer the standard statutory 2 year warranty which is a legal requirement within the EU. Basically, in order to claim on the warranty you will have to file an RMA with the retailer who sold the card within 2 years of purchaseing it. With this in mind the 2 year warranty is also non-transferable.
In future I think you would be better off looking at other brands, such as Asus who offer three years or BFG who offer 10 years. EVGA also offer a 10 year warranty, but they're a lot more costly than BFG.
On a personal note, I can understand why EVGA cost so much, as their warranty is very long. However, when it comes to XFX, I feel they should be much cheaper and more inline with budget brands like Palit, due to the 2 year warranty.