Wouldn't it be better to go with a H97 motherboard with a 4790K cpu and stock fan if he won't overclock anyway? With saving money from these parts he can get a better gpu, hdd or anything he needs
@OP: go with 2x4, if you want to have 16gb later, just buy another kit. when you need 32 gb, you'll probably buy a new computer anyway
Improving the build you have in mind:
PCPartPicker part list:
http://uk.pcpartpicker.com/p/3YvtBm
Price breakdown by merchant:
http://uk.pcpartpicker.com/p/3YvtBm/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor (£174.90 @ Amazon UK)
Motherboard: Asus Z97-A ATX LGA1150 Motherboard (£110.24 @ Ebuyer)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory (£50.77 @ Amazon UK)
Storage: Kingston SSDNow V300 Series 240GB 2.5" Solid State Drive (£69.99 @ Amazon UK)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card (£274.98 @ Amazon UK)
Case: Zalman Z3 Plus ATX Mid Tower Case (£26.99 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£49.98 @ Novatech)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£75.54 @ Aria PC)
Total: £833.39
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-24 12:17 BST+0100
Also, if you're never gonna overclock..