You can still get an instructor rating issued with only a JAR PPL-H but you do need "theoretical CPL(H) knowledge" as per JAR-FCL 2.335(b);
Before being permitted to begin an approved course of training for a FI(H) rating an applicant shall have:
(b) met the knowledge requirements for a CPL(H) as set out in Appendix 1 to JAR-FCL 2.470
If you don't have your CPL(H) though, you won't be able to instruct for CPL(H) but an IRI(H) shouldn't be any problem to get as a PPL'er;
JAR-FCL 2.310 Instructor ratings - General
(a) Pre-requisites. All instructors shall hold at least the licence rating and qualification for which instruction is being given (unless speficied otherwise) and shall be antitled to act as pilot-in-command of the aircraft during suich training.
See also JAR-FCL 2.395. Interesting that you only need a PPL-H for an IRI(H) but you do need a professional licence in order to get an SFI(H) (synthetic flight instructor) issued, as per JAR-FCL 2.410.
Last edited by Martin1234; 27th Nov 2004 at 04:18.