Rover 25 51 plate faulty passenger side electric mirror?

I've just bought a rover 25 1.4 on a 51 plate. I've noticed that the driver side electric mirror works perfectly, but the passenger side does not work at all.
I would assume if it's a fuse, then neither side would work. Just not sure if it's the motors, switch, or wiring in between that's faulty.

Anyone have any ideas if this is a common fault? or where to start looking for a fault?