Driver's door mirror not folding

[Kenny14]

On my 2021 HS PHEV Exclusive the driver's door mirror has recently stopped folding. It won't fold when I lock the car or when I press the fold button inside the car. The passenger side mirror continues to work perfectly.
Any ideas on things I could investigate before arranging a visit to the dealer?

 

[salty]

Presume it's not making a noise, as though it's trying to fold. If no noise, possibly a motor failure. This is a long shot, as I'm presuming both mirrors are on the same fuse, but you never know (this is an MG after all) check what fuses are for the mirrors.