Scan now have the budget RX460 graphics cards available for sale - the Sapphire RX460 2GB seems to be their cheapest model at the moment - available for £107.99 with free P&P for AVForums/Hexus members or collect from store.
Summary from HotHardware review:
"The Radeon RX 460 offers similar performance, more features, and better power characteristics than the GeForce GTX 950, for less money. It's not going to break any benchmark records, but the Radeon RX 460 is a compelling option at its relatively low-price point."http://hothardware.com/reviews/amd-radeon-rx-460-review-with-asus-strix