Hey there @julie_m @rambo1152 thanks for the replies.
I can't see anything which would be jamming the motor. The rollers turn easily too when I set the time. Looking around the net, I wonder if the motor needs some oil?
I've attached the photos. There's a higher resolution version here:
********************a/BtjdQ
The motor looks quite a tight fit so I'm unsure how easy it would be to get at it. I'll open the case up again today and check it out. Any more suggestions after seeing the internals?