Auto Tit1 confusion



hI m8's. This is my first post. My box is a ntl Pace 4001. I am on Telewest. About a month ago all the channels went of. To download the new NTL firmware I made up the interface so that I could change the Frequency and NetID in my Box so that my box would work at my friends house who is on NTL the box took the NTL Firmware update . I Put the box back on my Telewest with my Tit2 everything worked perfect until last week. I am trying to make a auto Tit1 card. I know my Box key and IRD. Do I have to use a NTL Rom10 image or a Telewest Rom10 image ?