What can you get for these money? I don't follow UK computer market (this is like $520 in US), and this is not enough for CS laptop to last you for years. You are looking for
- a lot of RAM (so you can load it with VMs)
- a lot of hard drive (to store all these VMs and their files, and probably to multiboot)
- decent LCD (14" at least, and definitely not 1366x768 crap).
So, check your stores, and let us know what you can get for these money.