Hello alzhmfc1970
Thanks for taking the time to post your TiVo box query via the forums, we appreciate you raising this and welcome to the community.
As newapollo has advised the charges are the same for both new and existing customers. I've been able to locate an account for you so to arrange this you will need to call the team on 150 or 0345 454 1111 option 1, option 4 then option 4.
They will be happy to make the arrangements for you.
Rob