Cheap but chic?

macaroni

The Link are offering Sony ericsson on 3 for£15 per month basis and get the full 18mths at half price ( cashback)

See the offer here

Go through Quidco and get £35 too

z4kir

Overall seems a pretty ok deal, I'm at work at the moment so can't exactly search to see if there are any better deals on this particular phone. (the poor camera is annoying though)

CPW give you 60 days to claim your chequeback (most offer 30) so very generous, don't think they ask for the original statement to be sent as they also accept online printouts. All in all not so bad (downside is the camera, you might want to go into a phoneshop and see the handset and how it works before hand)

Mercenary

If you don't mind the Virgin network, they have the Nokia 2310 (v. basic but has FM radio too) for £24.99 PAYG +£2.99 p&p
or the very very basic Nokia 1112 for £19.99.

Offer on at the moment - you get 200 free talk minutes with these phones (and others)
see: http://www.virginmobile.com/vm/payAsYouGoPhones.do