I've tried this a few times over the past 4 or 5 yrs with ntl... always worked. My last deal was 10mb for 6 months at £19 a month, this has only just finished about a month ago... I only got that because of ringing retentions and threatening to go with Be.. Plus they messed up my bill, so I used that as a gripe too. I'd feel a bit cheeky ringing them back to try and get another deal so soon after my last one.
