Pringle1, as you are a professional pilot, you will doubtless know the answer - or be able to find it in LASORS.....
In case you can't:
Have at least a CPL(A) or completed at least 200
hours of flight time of which 150 hours as
Pilot-in-Command if holding a PPL(A).
i. Completed at least 30 hours on single engine
piston powered aeroplanes of which at least 5
hours shall be in the six months preceding the
pre-entry flight test.
ii. Completed at least 10 hours instrument flight
instruction in aeroplanes of which not more
than 5 hours may be instrument ground time
in a FNPT or a flight simulator.
iii. Completed at least 20 hours of cross-country
flight as PIC of aeroplanes, including a
cross-country flight of at least 540km (300 nm)
in the course of which full-stop landings at two
aerodromes different from the aerodromes of
departure shall be made.
iv. Pass a specific pre-entry flight test with a FI
qualified as per JAR-FCL 1.330(f) based upon
the proficiency check as per JAR-FCL
1.240(b), within the six months preceding
the start of the course.
PPL/FIs were quite happily providing remunerated flight instruction at PPL level years ago. The industry valued their experience.
However, under the new proposals, there is nothing to prevent people-tube wannabees from hours building as FIs - the difference being that schools will probably have a wider choice of applicants to choose between.