To be able to give you a good reply, tell us how the computer are going to be used (gaming laptop, multimedia laptop, only using office etc etc..).
Meanwhile you have laptops at the famous newegg.com, look
here and by using finansportalen.se I was able to see that 500 pounds is 783.56 USD right now.
(I now see that you already mentioned how the computer is going to be used, but I recommend that you think one more time about it and that you check out the newegg link as well.)