i dont think you need an expensive mobo. You can get a cheaper one and get a better card or an i5

I Would Go For a ASRock Z77 Extreme4 Motherboard Instead Which Is Only Around 100-110 GBP If I'm Not Mistaken And Could Maybe Get An i5 With The Remaining Money, I Have One And It Is An Amazing Motherboard. Get a New Graphics Card Later On, Your One Now Is Fine For Playing Games On Medium - High Settings With Moderate FPS, But You Will Want To Go For Something Like a GTX 670 Later On.

-MD5

You can do much better for 600 GBP.

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CPU: [ Register or Signin to view external links. ]
Motherboard: [ Register or Signin to view external links. ]
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PSU: [ Register or Signin to view external links. ]
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Cooler: Use the stock.

Total: 577.56 GBP including delivery and VAT.

If you can spend an extra 25 GBP then I'd recommend a Cooler Master Hyper 212 EVO.

I didn't go with the 3570K as I wanted to give you the option to buy the cooler so you can overclock, if you do want the 3570K then it can be found for about 10 GBP more.