We recently had to do this. It’s hard to look past the Dell Outlet.
For extra VFM look for a “scratch and dent” laptop – sounds bad but somebody will have scraped the lid or underside during assembly. It’s never on the screen. Apparently.
http://outlet.euro.dell.com/Online/InventorySearch.aspx?brandId=7&c=uk&cs=ukdfh1&l=en&s=dfh
Anyway, something with an i3, 4GB, windows 7 or 8, will see you good for a good few years.
Also, as an aside, nearly all laptops are now “widescreen” so the screens seem wider, but not as much vertical info when browsing the web etc. Anyway, a 14″ widescreen seems wider than an older 16″ one. Something to bear in mind.
I wouldnt buy an new laptop bigger than 15.6, but prefably 14″. Maybe that’s just me.
#Edit – Dang forgot to say prices are plus VAT and delivery. But when you get to checkout delivery is free. Takes about 4 days.