MSI Radeon RX 480 Armor OC 4GB only £169.98 with Free Delivery from NovaTech.
(There are two versions of this card, this is the faster OC version, RX 480 ARMOR 4G OC)
This isn't the fastest or the most swish Radeon RX480, but it is probably the cheapest at the moment that I can find.
A not so fast 1291 Boost clock, the gaming series reaches over 1300+ but it is still more than some of the lower end RX480's.
The fans stop below 60c, and the custom cooler is much quieter that the reference design.
This has the Armor Branding, so is less in your face than the Gaming series, it does not have a back plate, or any RGB lights, but is more subtle if you don't like the Red theme.
They also have the 8GB version for £199, but they are not in stock yet.