Hi Guys,
Landing Gear - The JAR CPL still exists (it's only just being introduced....) I think you are getting confused with the old CAA CPL which is soon to be discountinued.
Cron - If tyou want to be an instructor you need to have passed the CPL (not necessarily ATPL) exams before you can start your FI course. If you want to earn money you must also take/pass yr CPL flying exams.
GJB - you wrote "to be an instructor you must study for the ATPL writtens and complete the CPL module". The JAR CPL and ATPL theory courses and exams are supposed to be different as far as I know, although there are obviously major overlaps with the sylabus on both.
All the best.