Which PC to get

Solution
It says 1070 as far as I can see. :(
If that isn't the case get the list I put together and get a local store to assemble it on the cheap, and get a Win 10 key from Kinguin with protection.
If I had to choose, go with the second, but let me make you a list, then get a local store to put it together for you.
The second one is actually a fantastic deal for those components, i'd actually save the bother and get that.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor (£189.75 @ Amazon UK)
Motherboard: Gigabyte GA-B150M-DS3H Micro ATX LGA1151 Motherboard (£62.65 @ CCL Computers)
Memory: Kingston 8GB (1 x 8GB) DDR4-2133 Memory (£38.05 @ BT Shop)
Storage: Toshiba 2TB 3.5" 7200RPM Internal Hard Drive (£35.94 @ Aria PC)
Video Card: Palit GeForce GTX 1070 8GB GameRock Video Card (£379.97 @ Amazon UK)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case (£31.98 @ Ebuyer)
Power Supply: Corsair CXM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£51.60 @ CCL Computers)
Total: £789.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-12-03 06:50 GMT+0000