Finally got around to processing some data captured on the morning of the 30th December.
The seeing was reasonable and Saturn was quite nice to view in the eyepiece, and the red channel. Green and blue suffered a bit but the end result is my best Saturn for this apparition.
The fluctuating seeing meant that the 5x powermate capture was actually the best of the bunch. It was captured at 15fps (1/15s exposure), for about 100 seconds in each channel. 210 frames from each channel made up the final stack. Processed in Registax and Photoshop.
The 3x barlow and 2x barlow images were captured shortly after the 5x image.
I'm happy with this image anyway and look forward to trying again when the sky clears - before Saturn heads too far North and an ever decreasing altitude from my latitude.