Well,that self install went quite well. Had my account and area numbers ready as it said in the instructions but they were not needed when I rang the automated line to activate. I was suprised to see the leaflet that said I don't have to return the SB 2 but Ive not looked up the website which suggests the disposal of it yet.
All that remains is to do a few tweaks as suggested towards the end of this video
https://youtu.be/aB_ZSwdeFwM