New PC max £400

PCPartPicker part list: http://pcpartpicker.com/uk/p/l4SV
Price breakdown by merchant: http://pcpartpicker.com/uk/p/l4SV/by_merchant/
Benchmarks: http://pcpartpicker.com/uk/p/l4SV/benchmarks/

CPU: AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor (£71.95 @ Scan.co.uk)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£26.65 @ Scan.co.uk)
Motherboard: Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard (£39.74 @ Scan.co.uk)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£30.96 @ Scan.co.uk)
Video Card: MSI Radeon HD 7770 GHz Edition 1GB Video Card (£93.32 @ Scan.co.uk)
Case: Cooler Master Elite 335 Upgraded ATX Mid Tower Case (£32.87 @ Scan.co.uk)
Power Supply: XFX ProSeries 450W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£35.99 @ Novatech)
Optical Drive: LG GH24NS90 DVD/CD Writer (£13.98 @ Novatech)
Optical Drive: Samsung SH-222BB/BEBE DVD/CD Writer (£11.96 @ Scan.co.uk)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) (£68.35 @ CCL Computers)
Total: £425.77
(Prices include shipping, taxes, and discounts when available.)

This build does the job. If you want to get down to your 400 price point, just drop the CPU cooler, but I recommend getting it soon because the stock cooler on the 965 is pretty loud.
Ask with any question.
Cheers

Does football manager really require a dedicated graphics card? and 8 gb ram?

I made a similar mistake when I tried to have a build that was cheap as possible. Now had I actually waited 1-2 months extra then I could have built something that was suited for me and would last a few years. Take for example that amd processor. I have that processor which I bought for £80 odd but for another 80 I could have had I5 2500k and that would've been perfect for me. Now I am at the stage where I am going to buying the I5 processor soon which will mean I will have bought 2 processor when I actually should of just waited and just bought one.

Bear that in mind.

My brother really doesnt use computers much so he wont want to upgrade he just needs for Football manager 2013 and simple web browsing and watching videos

It definitely won't need the 8GB of RAM. You could get a lower end GPU, but I do recommend it.
I wasn't even thinking earlier. You could easily go the APU route.

You could go with this as well.
PCPartPicker part list: http://pcpartpicker.com/uk/p/l73D
Price breakdown by merchant: http://pcpartpicker.com/uk/p/l73D/by_merchant/
Benchmarks: http://pcpartpicker.com/uk/p/l73D/benchmarks/

CPU: AMD A6-3670K 2.7GHz Quad-Core Processor (£61.63 @ Scan.co.uk)
Motherboard: Gigabyte GA-A55M-DS2 Micro ATX FM1 Motherboard (£37.19 @ CCL Computers)
Memory: Kingston Blu 4GB (1 x 4GB) DDR3-1600 Memory (£14.99 @ Novatech)
Case: Cooler Master Elite 335 Upgraded ATX Mid Tower Case (£32.87 @ Scan.co.uk)
Power Supply: XFX ProSeries 450W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£35.99 @ Novatech)
Optical Drive: LG GH24NS90 DVD/CD Writer (£13.98 @ Novatech)
Optical Drive: Samsung SH-222BB/BEBE DVD/CD Writer (£11.96 @ Scan.co.uk)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) (£68.35 @ CCL Computers)
Total: £276.96
(Prices include shipping, taxes, and discounts when available.)

I always forget about APU. This would do just fine. I downgraded to one 4GB stick, but there is room for more.

http://pcpartpicker.com/uk/p/lbv5

Ok so no my brother has decided he wants to spend the full £400 and get the best he can
He also wants a small case so gone for MATX
how do that build look
thanks guys

That build looks solid.

The 7770 is an excellent budget GPU.

The 3220 is a better processor than any APU by AMD.

I think he would be very happy.

BTW, that case is pretty awesome.