Max Guymer :
Hey thanks! Would there be much difference between a 4670 and the 4460? Also if there were, would there be any consequences of cheaping out on the mobo a tiny bit and going for that processor?
There isn't a major performance difference between the i5-4460 and the i5-4670; personally I find that the i5-4460 is a better value processor, you're getting similar (albeit slightly lower) performance for a cheaper price. However I of course support purchasing the i5-4670 if you want better performance and I agree with you - you can indeed purchase a cheaper quality motherboard with no performance consequences.
With that being said, if you're keen on the i5-4670 then I'd recommend the following:
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i5-4670 3.4GHz Quad-Core Processor (£161.94 @ Aria PC)
Motherboard: Gigabyte GA-H81M-H Micro ATX LGA1150 Motherboard (£33.35 @ Aria PC)
Total: £195.29
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-02-02 22:51 GMT+0000
The motherboard is unfortunately micro-ATX (otherwise known as mATX or uATX), as you stated you wanted an ATX board; regardless the micro-ATX will fit in most (if not all) ATX cases. Tied in with the i5-4670, purchasing an ATX motherboard would exceed your £200 budget.
The other build I recommended you in my previous post is still a decent build, considering you're getting a 9 series motherboard. The current build with the i5-4670 in this post is not a 9 series motherboard, hence why it's significantly cheaper. The motherboard I've recommended in this post is an 8 series; the only difference with the 8 and the 9 is that the 9 series motherboard will support Intel's next [5th] generation processors, dubbed Broadwell. This is not an important factor if you're not looking to upgrade anytime soon, hence the 8 series motherboard is more than adequate.
The i5-4670 does provide better performance over the i5-4460, and in gaming you may notice a minor difference (between 1 to 5 FPS perhaps).
All the best.