While we're on this subject, what are the requirements for a CPL?
(
edit, and apologies for a wannabe-esque question, from looking at GID24 - which also doesn't answer my question

- what is the difference between CPL and ATPL theoretical knowledge? GID24 makes it look like there are fewer exams requiring much less study time - 200 hours for a PPL(A) holder vs. some 750 study for an aspirant ATPL - but I've never heard of CPL theory before...?)