Regardless of other countries pricing, because we've always had some issues here with how things end up translating into Sterling. The overall increase in pricing I've seen from 980 > 980ti > 1080 was something like £150 from start to end, it really isn't as bad as people are making out for a premium high end item, you have to remember these aren't marketed at everyone.
This thread is about the 1070 if you hadn't noticed. So talking about prices at the "premium high end" isn't exactly relevant.