Good discussion subject and my thoughts....
In Oz spin training is only neccessary for the the aero rating, for the Grade 3 Instructor Rating (initial) what is required is a demonstrated proficiency in recovery from a spin - neccessary for the situation if Bloggs stuffs up a stall and you are too slow to correct, I guess. Some individual CFI's for reasons known to them like it taught also.
Stall training is somewhat different with demonstrated recovery required from the incipient, clean, approach, climbing and descending configuration and wing drop, and so it should be. I suppose the thought process is if you don't stall or if you do but can recover you can't spin. Known as stall/spin avoidance under your JAR FCL PPL perhaps.
Spiral dive recovery is also another syllabus item that is covered in detail.
Now, I don't have figures at hand but I would consider that accident or incidents of inadvertent spinning would not be all that common, in fact I have never had a story of one related to me. (Yes, don't shoot me down, I know I do not know everyone).
But stories that have been related to me and there have been quite a few of these, are the ones where an intentional spin has been entered in a typical training aircraft (ie C150 etc) and the pilot has had quite a hair raising and very scary time trying to get out of that spin.
After 7000 hrs of Single Pilot ops,with 1500 hrs of instructing from a Grade 3 up to and including Chief Flying Instructor together with my own training, Licence Tests, endorsements, renewals and Base Checks I have never found myself anywhere near entering an inadvertant spin and believe me, I'm no Chuck Yeager.
WWW, I may be a bit judgementalhere but I reckon that if you find yourself departed from controlled flight with punters down the back you haven't done your job properly as you should not have allowed yourself to get into that situation and should have recovered from the first onset of stall (and you shouldn't have got there either).
By all means, if you want to do spin training, do it and it can be a lot of fun and skill enhancing, but mandatory for PPL/CPL, I don't think so, it can be covered quite sufficiently in discussion.
Maybe that is why those making the syllabus don't have it as a required training session.
As I said, my thoughts...