Thanks for the support guys, did too much renovating yesterday and had a few hours forced time off with a heat pack today, getting old.
So I spent a few minutes on the PC and added auto-port detect, as others have said thanks to JJ posting that neat idea.
In my case auto-detect can be overridden if needed by selecting a port other than NONE. If the manual selected port fails then auto port is invoked. It’s also invoked on a new install, IE no radio.ini file. If autoport finds the DAB port then the Radio.ini setup file is updated.