This was posted on the MSCC bulletin board:
We have a warranty campaign running to replace the starter motors on early Plus Four cars. These are cars built between May 2020 and February 2021. attached is a list of the cars affected in the UK. Even though these cars are out of warranty, we would still replace the starter motors free of charge to any owners.
We really recommend that these starter motors are changed.
Any Morgan owners with affected cars can contact their preferred Morgan dealer and get their cars booked in for the job. We have sent starter motors out to all of the dealers who sold the original cars, but it is always best to contact the dealer first and make an appointment.
The job is not long, but the dealer will tell the owner how long they need the car for. Within a day assuming the new starter motor is still available with them.
[The list of cars impacted is on an excel file, this is not a valid file format on this forum, but the build dates are shown above. If in doubt I suggest confirming with MMC]