In order to undertake a course of FI training you must have 200 hours of flight time including 150 hrs PIC if the holder of a PPL. You must have passed the CPL written examinations, have 30 hours on single engine piston aeroplanes including 5 hours in the 6 months preceeding the pre-entry flight test. Pass a pre-entry flight test within 6 months of comencing the course. Have a minimum of 10 hours dual instrument instruction ( no need for IMC rating) You must have 20 hours of X-Ctry time including a 540 Km X-Ctry with two intermediate landings conducted in one day.
And you can't be paid if you hold a PPL.