There should be an obvious answer to this, but I can't see it. How do I force all axis labels to be rendered rather than what I get now - I will add attachment shortly.

Hi Kevin,
If you wish to tell the axis that it has to display every label you need to specify custom step of 1 - for example:
ordinalScale.MajorTickMode = MajorTickMode.CustomStep;
ordinalScale.CustomStep = 1;
Hope this helps - let us know if you meet any problems.

Best Regards,
Nevron Support Team