Two builds, one adding case/PSU and increasing budget, other maintaining £400 budget.
Be advised with the second build with the H110 mobo that you could have a BIOS update issue. If the board comes with BIOS version 1.4 or greater, the CPU will boot, no issue. If the BIOS version is older than 1.4 then you will need to use a Sky Lake processor in the CPU in the socket to allow the system to boot and subsequently update the BIOS. Kind of a chicken and an egg thing.
PCPartPicker part list:
https://uk.pcpartpicker.com/list/rrkwpb
Price breakdown by merchant: https://uk.pcpartpicker.com/list/rrkwpb/by_merchant/
CPU: Intel Core i3-7100 3.9GHz Dual-Core Processor (£109.14 @ Eclipse Computers)
Motherboard: MSI B250M PRO-VDH Micro ATX LGA1151 Motherboard (£69.64 @ CCL Computers)
Memory: G.Skill Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (£59.30 @ Amazon UK)
Storage: Seagate BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.94 @ Aria PC)
Video Card: Zotac GeForce GTX 1050 Ti 4GB Mini Video Card (£129.99 @ Ebuyer)
Case: NZXT Source 210 (White) ATX Mid Tower Case (£34.98 @ Amazon UK)
Power Supply: Antec EarthWatts Green 380W 80+ Bronze Certified ATX Power Supply (£43.47 @ Scan.co.uk)
Total: £482.46
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-02 12:57 GMT+0000
PCPartPicker part list:
https://uk.pcpartpicker.com/list/ZKjW6X
Price breakdown by merchant: https://uk.pcpartpicker.com/list/ZKjW6X/by_merchant/
CPU: Intel Pentium G4560 3.5GHz Dual-Core Processor (£55.20 @ Aria PC)
Motherboard: MSI H110M PRO-VD PLUS Micro ATX LGA1151 Motherboard (£42.30 @ Novatech)
Memory: G.Skill Ripjaws 4 series 8GB (2 x 4GB) DDR4-2400 Memory (£59.30 @ Amazon UK)
Storage: Seagate BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.94 @ Aria PC)
Video Card: Zotac GeForce GTX 1050 Ti 4GB Mini Video Card (£129.99 @ Ebuyer)
Case: NZXT Source 210 (White) ATX Mid Tower Case (£34.98 @ Amazon UK)
Power Supply: Antec EarthWatts Green 380W 80+ Bronze Certified ATX Power Supply (£43.47 @ Scan.co.uk)
Total: £401.18
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-02 13:11 GMT+0000