Indeed. I'll gve you an example of a training gap. Obviously ATPL candidates study Performance of both Class A and B in their theory courses. Candidates for CPL, or PPL holders studying for the HPA rating do no Class A study even though their licences allow them to act as PIC of Perf A biz jets like the Citation, if under 5700 kg. I flagged the obvious safety issue to the CAA, suggesting that these candidates should do the full Performance syllabus, not just the bit restricted to light pistons. Nothing....