I have had broadband off NTL for a couple of years now and was paying £17.49. Now seeing as there is lots of 'free' broadband offers out there (but not quite free!), i phoned them up and said I want to leave to transfer to one of these, straight away they offer you a reduced rate at £9.99 for 6 months, after 6 months just phone them up again and they will give you another 6 months and so on. Figured this would say save peeps a few bob.
P.s. you can ring them on 01256 752000 if you don't like 08 numbers.