So cracked on and eventually made progress today albeit probably the long way round, as the nav book was of little help and refreshing DAB just came back with no signal.
What I found worked for me was to go into DAB and select Manual, I then pressed the right arrow on the dash (between the Radio & Media buttons).
Once it had searched and found a clear channel, I toggled right to the next page with the joy stick, selected preset from the menu and pressed and held down on the joystick and it preset that channel to number 1
I returned to manual, right arrow to next channel and repeated the presets another five times.
Once I had my six preset channels showing on the preset screen and had selected one to play, I toggled right again and selected Stations from the menu this brings a drop down list of all the stations on whichever preset channel is selected.
So even though it was a long winded effort from an old timer lol! I now have 6 preset channels all of which provide a number of station each and at the moment seem unaffected by the dash camera.🤞 fingers crossed