A replacement PCB is in the region of £600 but Morgan do not appear to have any stock.
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Confirmed by BHM that a faulty PCB on my 2017 4/4 is the reason for the fog lamp remaining permantly on. They have no replacements are also waiting for the Factory to deliver - I won't hold my breath then!
Sorry to hear that I guess you now need a second switch in the circuit.
MMC is leaving all of us at risk with their toy town PCBs. I am on my second & as of now the lights are wired on permanently so it works!