Welcome to the forums!
I'm not really familiar with prices in the UK (I'm guessing that's where you're located since you refer to pounds). My guess is that 1500 lbs is about $2500. With the VAT and what seems to be a higher prices "across the pond" I would recommend you look at the Performance build
in this issue (p. 95) and use that as your starting point.
To make up for the components you need which are not included in the build (like the monitor and keyboard), drop the GPU down to a 770 and see what you can buy. Next, I would look at a cheaper motherboard and perhaps switching to the 4770K if that will save you some money. Hopefully these steps will provide you with enough savings to purchase everything you need.
I would suggest you assemble a list of components and post them here. We can then verify compatibility and offer advice if you have any other questions.
Hope this helps.