Yes, you are correct, this works, I don't have FTTP I don't think you have either ?
Obvious I was trying the option applicable to my installation "I am an ADSL and Fibre to the cabinet Broadband Customer" although that narative in itself is very confusing, would think it should read "...ADSL or Fibre to the Cabinet...", strange.
Anyway, glad to have access to my BRAS IP profile again, thanks for the tip.