I bought this in the end,
http://www.ebuyer.com/product/187463 very slightly different spec to the previous one I listed (but surprisingly the same Toshiba part number

), and it should be here tomorrow.
Regarding screen size, don't laugh, but one thing I wanted it for was to watch iPlayer when on my turbo trainer. So, bigger screen = better, but more than one person has warned me off buying a 17" laptop - too big, too heavy, too cumbersome.
Anyway too late now, it's on its way!
Had a delivery from Amazon yesterday, MS Office 2007 Student/Home edition, 3 user licence for £60.00 delivered which seems pretty good value. So that'll go on the laptop. Amazingly nobody in the house can remember (or will admit to) buying it using my wife's credit card, but with three students in the household it will be well used.
PS Hell will have to freeze over before I'd ever use DABS again. They sold me a completely unsuitable back up drive and expensive software some years back. They are almost impossible to communicate with and their return policy is tantamount to theft. Never, ever again.