CAP 804 (Reference only)
An applicant who has held an ICAO IR(A) or military green aeroplane Instrument Rating or a UK professional pilot licence aeroplanes or a valid Aircraft Owners and Pilots Association (AOPA) Ground Instructors Certificate within the 5 years before the date of application for the IMC Rating / IR (Restricted) will be credited with a pass in the Theoretical Knowledge Examination.
3.3.2
Credits An applicant who has held an ICAO IR(A) or military green aeroplane Instrument Rating or a UK professional pilots licence aeroplanes within the 10 years before the date of application for the IMC Rating is not required to undergo a course of flight or ground training but must pass the Theoretical Knowledge examination and initial IMC Rating / IR (Restricted) Skill Test.
3.3.3
UK National Professional Aeroplane Licence Holders IMC Rating privileges are contained within UK CPL(A) and ATPL(A) licences; (this does not include JAR-FCL or Part-FCL licences). There is no requirement for a separate IMC Certificate of Test for these licences.