Thanks very much, Richo.
For the experienced PPL holder going for CPL, I take it that as long as they've flown the hours required by the CAR in a registered or recognised aeroplane, and as long as the syllabus requirements are deemed by the CFI to have been met (with extra training as required) and exams are passed, they're good to go for the flight test?
As far as I can see, it's only for the PPL aeroplane licence that it specifically mentions a CFI determination, but the CPL orders seem to imply that the same kind of thing would apply, given that the person has flown the right hours.
So from your estimate of about half the normal training being needed, say the candidate has a PPL and has the 200 hrs as a pilot with the correct requirements re cross country etc, you'd be giving them 75 hours more to get to CPL standard (ie half the 150 hr commercial course), or have I got the wrong end of the stick here?