Lukes PC:

CPU: i5 4670 - Around £100-120 used
Or if you want to buy from a reputable seller:
	 i5 4460: https://goo.gl/ao6gF9

Motherboard: https://goo.gl/JfMMHW or https://goo.gl/bjrgMi

RAM: Use from old PC or if you want new: https://goo.gl/GdNUUd (Do not use with old ram)

GPU: That 760 for £65 was a good price.

Power Supply: Dont skimp on price, Corsair CX650s are reasonable, while not the best, perfectly usable.