Bit late in on this, but general advice:
Never buy anything that has the name "Packard" in it. Packard Bell only produce for PC World because nobody else will sell their ****. Hewlett Packard are very shoddy in most departments.
Other than that, generally, the only difference between a £300 laptop and £500 laptop is £200. I guess if you want to game or something, but generally it'll make very little difference as long as you stay away from the Celeron cut back crap CPUs.
Laptops only ever start to show how well or badly made they are after several months. I tend to find that as they hit 18 months to 2 years they show their faults. Sometimes brilliant laptops from the off develop hideous faults after this time (we had a run of Dells that were excellent, but just before their second birthdays, the drives started to fail on every single one. Most we'd had to replace the batteries on too, so we then had to invest in new drives.
We had a bunch of Toshibas as well, all brilliant, but within two years the keys all started snapping off. Until that point, they were excellent.
Generally when buying technology like this (that has an unknown working life (reviews can't help because they only ever test the things over a short period and don't spend 12 months unplugging them and lugging them around)) it's best to get a slightly older, 'end of life' model.
So getting a laptop from last years £500-£700 range for cheap at £300-£400 is a good idea. One reason it's good is that you can read reviews and check out issues people have been having with the machine/manufacturer over the months since it was released. It's rare you will ever need the very latest technology, so buying what was an expensive laptop for cheap is better than buying either a cheap laptop or an expensive laptop.
I understand why people buy laptops, but they're the most god-awful things in the world. Reliability, build quality and life-span are all seemingly completely random. Nightmare things and my most hated question is "which laptop should I buy?"
If they're rich, I always say "Mac", if they're not, I give them the advice above but won't recommend any particular make or model (beyond avoiding anything with Packard in the name, oh, and Advent).