Also, there would be tax implications around separating your business and having one side making a loss and the other side not - the IRD looks very seriously at these things.
Considering its the Guvment that forced Telecom to separate as they have I would suggest there are processes and methods in place at IRD to deal with it. Not that I would know anything, Tax accounts and its perpetrators are someone I would have on the first advance ship to search out the next galaxy by lunchtime if I could :(
Cyril