my laptop was 699$ and it's a Dual Core T3200, with 4GB of RAM and a DVD-RW burner.
I think 699$ is pretty close to 400 Pounds (hey, I don't memorize exchange rates), too.
But seriously, you are going to need a lot more horsepower to run that game. Even my laptop has trouble running most games (well, that's not 100% true, but it certainly can't compete with my desktop machine at all)