"Budget" 1070 model, might be of interest to some in combination with deals below.
£374.97 original cost, but potentially as low as ~£320:
-Which? £20 voucher (£1 sign-up cost) = £358.97
-2.3% or 2.2% TCB / Quidco cashback = £351
-Gears of War 4 Key (selling for ~£30 on eBay) = approx. £320 total cost
Personally, I am holding out for a GTX 980 Ti deal (<£250-275) as there is plenty of massively overpriced 980 Ti stock out there. I suspect Black Friday deals on 1070 might be very limited on the basis of what happened in the first Black Friday following the launch of the 9-series cards, and the sustained high demand for the 10-series. In addition, Nvidia's free Gears of War 4 game offer will have expired by Black Friday.