You rang? :D
Had the car into Solitaire at around 20,000 km, and asked that they do a 5 wheel rotation, as we were heading to Sydney over Easter last year.
When I picked the car up, they had only done a 4 wheel rotation, as I was told that it was too late to include the spare in the rotation sequence, due to the wear on the other tyres.
Basically, as above, the rolling diameter would be out enough to upset the car. I did ask about the scenario if I had a flat, and was told that as soon as the tyre was repaired, it should go back on where it came from, and the spare goes back underneath.

