For some reason between two keyframes, the camera swerves to the left over the course of 3000 frames for the centre, 45 and 90 degree passess. Very annoying.
I re-rendered and it still diverts, despite the keyframes being correct. I've had to recreate the keyframes from scratch and render. It looks good now.
41 hours of rendering and I have my replacement 9000 frames.
Total base rendering: 12 days, 1 hour.
