Thanks Mark.
I sent Bratislav some Canopus doughnuts to be put through his Roddier analysis software and he has just sent me the results. The optical train came it at over 0.92 Strehl and I'm happy with that. There is a small amount of residual astigmatism that we haven't been able trace. It could be thermals related or a small amount of mirror pinch. Rotating all the individual optics, did not change the orientation so it has been turned off in the attached report.
Damn good this test. Clearly shows the low zone near the edge of the primary, that I knew about (not significant), and the slightly turned up edge.