Finally got around to installing a usb and aux cable at the rear of the RCD330.
Was a bit of trial and error but finally got there.
Also decided to wire in a DAB adaptor as the FM reception is a bit poor.
Wired this into the cigarette lighter using the ignition cable.
Digital radio now plays through the AUX under the Media section.
I wasn't sure how good the sound quality would be but WOW it now sounds awesome!
Plus it gives me 63 channels.
The cat decided he'd come and watch.....