@RetroRaz You wouldn't believe it. After 3 years almost of being locked out of my menus, tonight I got back in!
I can only assume it was after doing that adaptation, channel 0, save. I did it a few times.
What I think triggered it was ignition cycling on / off as today, 1st time using the car, it started working when I got to the Shell station!
Im over the moon, now I can fit Polar Advance!