Hmm, you'll have a tough time getting a 13" capable of playing FM09 for £500 mate.
If you're willing to spend the extra few bob I'd highly recommend the Dell XPS M1330. Best laptop I've ever had and it'll easily run FM09. It's very light as well.
XPS M1330
If not, the Dell Inspiron 13" ain't a bad option, it's £200 quid cheaper than the XPS. It won't give you the same performance, battery life or durability but if you just want it for FM then it's probably perfect for you.
Inspiron 13"
Not sure about others, in my opinion most companies just don't make 13" Windows laptops as good as Dell do, I guess you could go for this Acer here, but check reviews before you do.
Acer