Thanks for the reply.
I do have a Blaupunkt Woodstock DAB 54 at the moment but I've had to put in a bit of a lash up to connect a CANBUS adapter for the Multi function steering wheel and separate Blaupunkt Bluetooth adapter for hands free all through the Quadlock and I've got quite bad engine noise interference. A local audio shop tried a Ground Loop Isolator on the pre out, which made no difference, and reckoned that the stereo might be faulty; some sort of protection circuit for the pre outs might have blown. I'm worried that the multiple connectors might be the problem, DIN to phono pre outs to quadlock adapter, DIN Y adapter for the Bluetooth and CANBUS, and the various power leads floating around for the aerial, Bose, Bluetooth unit and ignition.
If I can get the Bluestate with Bluetooth and DAB then I can at least get rid of part of the lash up, I'd end up with better quality than I have now. I could get an ebay Blaupunkt Nashville but might end up with the same problem if it's the wiring.