EVGA GeForce GTX 570 Classified £239.99 (Is this the best card, I don't really want to spend much more
Ah I see from your signature that you don't approve.. Could you suggest an alternative of similar price?
From a glance at his signature, I'd say he has a beef with Nvidia. That's fine, but it's not reality for everyone. The card you are looking at is an excellent card for the price- if I were to make a separate recommendation, it'd help for you to price out a GTX560Ti 448 and an HD7850 and HD6950 for us so we can help you evaluate relative cost vs. performance. Also, we're going to need to know what resolution you intend to run at.
Next, addressing your whole list, I'll make a few comments:
Motherboard: superb choice, but if you're not overclocking and don't need the extra slots, you can get something significantly (like half) less expensive without any affect to your build's performance.
CPU: Great CPU, but we typically recommend the almost-as-fast i5-3570. Hyperthreading is nice and cool, but it really doesn't add that much.
RAM: Stick with what you have unless you have a usage case for >8GB.
Graphics: Consider the above, but also consider this- you would do yourself extremely well to cut the cost of other components so that you can stretch for a GTX670. There really isn't a better all-around card on the market right now.
SSD: that's fine, but you don't need
that much space* ~120GB will be fine, and you don't need to spend so much. The nicer SSDs are not perceptibly faster than Crucial's now budget priced M4, and that gets my recommendation. If you can find Samsung's 830 on sale, consider that too.
HDD: If you have a fast SSD, you do not need a fast HDD- get more space with a slower 2TB 'Green' drive, or save cash with a smaller 'Green' drive. I've found that my 2TB Green from WD is more than fast enough for most games and any media.
Case: This is intensely personal with respect to style, but the Antec 302 looks well built and versatile, while being inexpensive.
PSU: That's a good one, but if you don't need power for multiple video cards, you don't need more than 500w. Also, Antec has an inexpensive 650w (JAE links it often) that may be less expensive.
DVD/CD: Generic is fine, you'll probably use it twice (I'm over-estimating).
You didn't add an aftermarket CPU cooker- Coolermaster's Hyper 212 Evo gets the nod around here for inexpensive, quiet cooling. Also, if you plan on overclocking, you can get either the i5-3570K or i7-3770K instead which overclock effortlessly. It makes even more sense to get the i5 here, as the already small performance gap nearly disappears with higher clockspeeds.
*You can install things like games (even Steam, Origin, etc.) to your spinning drive, and then use a Windows feature called 'symbolic links' to move them individually over to your faster SSD.