For some odd reason it's the normal non 3.1 card version that has disappeared from the ASUS UK site.
Intel i7 5960X @ OC 4.5GHz, Asus R5E, XSPC AX360, G.Skill Ripjaws 4 16GB DDR4-3000MHz, BeQuiet 1200W PSU, Cooler Master Cosmos 2, Zotac GeForce GTX 980 AMP, Creative X-Fi Titanium, 2 X Samsung 840 EVO 250GB RAID 0, 2 X Crucial RealSSD C300 256GB RAID 0, LG BH10LS30