I have used SVP in the past. Prices reasonable, delivey good and no quibble if you need to return something.
http://www.svp.co.uk/index.php?q=Laptops&nav=23
Of course, you might like to compare like with like at Amazon.
If your eyesight is up to it, get as small a footprint as you can as they are lighter to carry around and battery will power it for longer.
As for software, like MS Office, try-
http://www.software4students.co.uk/
You (or anyone for that matter) don't need to be a Student though, as they interpret the word liberally!
Good luck.