Final PC Buid

Solution
Here's a slightly improved version of Dranzer's list, while EVGA make fantastic cards, the Zotac mini is a full 40 pounds cheaper which can be invested elsewhere, and the B250 Gaming 5 is a great deal at 7 pounds more.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-7700 3.6GHz Quad-Core Processor (£271.14 @ Aria PC)
Motherboard: Gigabyte - GA-B250M-Gaming 5 Micro ATX LGA1151 Motherboard (£77.47 @ Amazon UK)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-2666 Memory (£111.59 @ Aria PC)
Storage: Kingston - SSDNow UV400 240GB 2.5" Solid State Drive (£69.96 @ Amazon UK)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM...
Here is the list:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-7700 3.6GHz Quad-Core Processor (£271.14 @ Aria PC)
Motherboard: Asus - PRIME B250M-A Micro ATX LGA1151 Motherboard (£69.84 @ Aria PC)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-2666 Memory (£111.59 @ Aria PC)
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£39.95 @ Aria PC)
Video Card: EVGA - GeForce GTX 1080 8GB ACX 3.0 Video Card (£487.06 @ Novatech)
Case: Corsair - 200R ATX Mid Tower Case (£55.96 @ Amazon UK)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply (£64.80 @ Alza)
Total: £1100.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-06-29 10:28 BST+0100
 
Here's a slightly improved version of Dranzer's list, while EVGA make fantastic cards, the Zotac mini is a full 40 pounds cheaper which can be invested elsewhere, and the B250 Gaming 5 is a great deal at 7 pounds more.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i7-7700 3.6GHz Quad-Core Processor (£271.14 @ Aria PC)
Motherboard: Gigabyte - GA-B250M-Gaming 5 Micro ATX LGA1151 Motherboard (£77.47 @ Amazon UK)
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-2666 Memory (£111.59 @ Aria PC)
Storage: Kingston - SSDNow UV400 240GB 2.5" Solid State Drive (£69.96 @ Amazon UK)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (£37.99 @ Aria PC)
Video Card: Zotac - GeForce GTX 1080 8GB Mini Video Card (£445.00 @ Amazon UK)
Case: Corsair - Carbide SPEC-04 (Black/Red) ATX Mid Tower Case (£47.40 @ Aria PC)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply (£64.80 @ Alza)
Total: £1125.35
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-06-29 10:37 BST+0100
 
Solution


Did I miss something why is your build £25 extra than mine it should be less as you save £40 on GPU and spend bit extra on Motherboard while saving again on Case.

Edit: You also included the SSD. I missed it.