dannyboi2003!
Well that is just the way it is - it is to do with NTL not making any money from the TV service so they have to sell you a phone line rental too!
But you would have been dissapointed, in any case. NTL digital boxes no longer supply channels 1-5 on the RF so your plan would not have worked.
However, channels 1-5 are available still on the cable so you could have done what you wanted using a cable splitter. I note that you already have NTL broadband so you already have an active NTL cable connection. You should be able to split your current cable to supply channels 1-5 to the other TVs and save yourself £10 per month!