[MovedGoalPosts]

Some ntl areas did used to have separate bills for different ntl services, maybe they still do, but I thought that things like "harmony" were supposed to have sorted all that out into one bill. You'd only need separate account numbers if there were separate accounts.

I'd be worried that I was going to get billed twice, and debited twice, even though one of those debits may have been set up in error, given the wrong surname spelling.

On the other hand if the surname spelling is wrong, you might be able to argue to your bank that it is not a valid direct debit mandate, worth checking with your bank, as an added line of defence against ntl doing something odd.