60 pounds less???
I don't know where you get £60 less from.
I noticed there are not many 1080 cards left with only 13 brands now, the cheapest 1080 is now £499.99 for ASUS Turbo, the cheapest 1070 Ti is £419.99 for both Palit and Zotac so that is actually £80 less.
I found something very interesting.
https://www.techarp.com/articles/geforce-gtx-1070-price-cut/
Official Nvidia MSRP for regular GTX 1070 is $349 (£315.83 inc VAT), regular GTX 1070 Ti MSRP is $379 (£343.26 inc VAT) that is $20 cheaper than Vega 56.
GTX 1070 and 1070 Ti UK prices should be cheaper with $1.32 exchange rate but increased due to miners or price gouged.
£60 or £80 who cares...if you have £420 to dump on year old tech then anyone can push to a 499 for a 1080