I think that's going to mean a low end build.
So LGA1150 mobo and CPU (i3 4130), RAM, with case, power supply, Operating System, Hard Drive and Optical Drive. I doubt you'll have enough in your budget fro a graphics card, so you'll have to just do with the i3 4130's integrated graphics (HD 4400)
Your Parts list will look something like this -
i3 4130
ASRock H81-PRO-BTC Motherboard
G.Skill Ripjaws F3-12800CL9D-4GBRL (2x2G) DDR3 memory
BitFenix Merc Alpha Mid Tower Case
Corsair VS350 ATX Power Supply
Windows 7 64 bit Home Premium
Seagate Barracuda 1TB ST1000DM003 Hard Drive
Have you used Partpicker before? You should have a go at using it. I'm not in the UK, so I don't know prices or sources.
So find partpicker - google it -, put a...