Not sure how Morgan was able to not comply with U.S. OBDII rules, perhaps because they are viewed as a motorcycle in most states? In any case they don't have a standard OBD port, just the very small micro USB port under the screw cover on the ECU (with incredibly small screws btw). Good news is the ProTune software is free from S&S and you can read and reset codes with it. Bad news for Mac users (me) is ProTune software is Windows only so requires a Windows PC or Parallels for Mac.
I've purchased a short micro USB to USB-A (normal size) cable and plan to insert it in the ECU and silicone it in place the next time I need to plug in. With a cover on the exposed USB-A end, I think it should be fine to leave it in place to make future plug-ins simple.