Sorry, you do need the CPL
The place I did my CRI is BCFT Bournemouth also does the IRI, great school
http://www.bcft.org.uk/flyinginstructorcourseiri.shtml
Pre-entry Requirements- Hold a valid Commercial Licence with a valid Instrument Rating
- Have a total of 800 hours flight time in accordance with Instrument Flight Rules
- If the recorded flight time is by sole reference to instruments - not just under IFR - then the recorded total may be multiplied by four, so that 200 hours by sole reference to instruments will meet the requirements
- Hold a current Medical Certificate
Training Syllabus
The syllabus to be followed is based on JAR FCL 1.- 10 hours minimum flight training
- 45 hours minimum of Ground school charged. 25 hours home study
- Pass a skills test with an FIE
- Course duration - full time approximately 20 working days - dependent on weather
Course Prices
Multi-engine a/c10 hours @ £355/hour£3,550.00Ground School45 hours @ £15/hour£675.00