Updates
Connecting an official Apple lightening camera connector via an official Apple lightening to USB adapter returns an unrecognised device iOS message. So the former is consigned to the bin! However there is some good news …. The Meridian Explorer DAC works perfectly interfacing to iPhone USB-C port using an official Apple USB-A to C converter
Ensure you follow this: https://community.roonlabs.com/t/ios-settings-when-using-external-dac-via-usb-c-port/264111
So now, I cannot charge the phone whilst travelling as there is no charging port. I guess I can either: a. charge the iPhone wirelessly or b. buy a new car. I do hope this is of use to those who persist in sticking to car audio line-in. Thanks for listening!