Just found quite a few Web&Walk cashback deals on RM's site. Needless
to say, they require a large amount of cash up front (£32.50 or £42.50
a month).

Have chosen this one:
http://www.reestitmutton.co.uk/MOBIL...l.php?aid=6489

O2 was late delivering my PAC code so I insisted on a £4 refund.

Phones2U have a 21 day from bill date cashback window. Going get as
many friends to get on the 3 cashback scheme as possible so we can
co-ordinate claims! They also pay out £20 per friend so I reckon you
can make about £70 each if you sell the phone (on top of the free line
rental, calls, SMSs and web access).