Good news - have just visited Plymouth Lexus and, with a bit of trial and error, Andy from Sales got me up and running. The critical step for me was, having refreshed the DAB station list via the Audio Set Up menu, I always had a blank screen showing the message "no signal". However, slowly turning the left hand knob on the audio unit panel revealed all the DAB stations coming up one by one grouped into ensembles (in my case BBC, National, Plymouth and Cornwall). Once a station is selected then you can use the DAB Settings menu and Presets to store it in the list of presets. Thanks to Andy I now have my favourite 6 DAB stations available as presets.
PJ