That isn't what we are talking about though. Yes the 1080Ti ( or whatever it will be called) will be a £500-£600 gpu, but we are talking about 980Ti PERFORMANCE, which will no doubt be matched (maybe even beaten) by Nvdias 970 pascal equivalent for ~£300.
Don't get your hopes up, ~£300 is current GTX970 level and it is Nvidia's 3rd tier GPU if we exclude Titan X. It is far more likely we will get 980Ti level performance for ~£400 from Nvidia's Pascal 2nd tier.
~30% faster than 980Ti for ~£500 - £550
980Ti level for ~£400 - £450
980 level performance for ~£300 - £350