HEDP, the info you require will be found in LASORS
LASORS
Basically, the bits that will affect you are
• A QSP(H) who has held an AAC (unlimited) or
Unrestricted* Green (or Master Green) helicopter
instrument rating within the 5 years preceding the
date of application for the IR(H), will be required
to complete flight instruction at the discretion of
the Head of Training of an approved FTO.
• A QSP(H) who has held a AAC (limited) or a
restricted* Green (or Master Green) helicopter
instrument rating within the 5 years preceding the
date of application for the IR(H), is required to
complete a minimum of 15 hours IR training at an
approved FTO, of which 5 hours may be in a
FNPT 1 or 10 hours in a FNPT 2 or flight
simulator.
*The terms “restricted” and “unrestricted” apply as used
in MOD documents referring to the pilot Instrument
Rating Scheme. Thus “unrestricted” is the privilege to
operate as GAT or OAT in all classes of airspace;
“restricted” refers to any restrictions applied by
Commands/Groups according to the experience of the
pilot or limitations of the aircraft/helicopter type.
In all cases the applicant is required to obtain a 170A
Certificate of Training and Competence from an
authorised 170A signatory. A QSP claiming the above
credits must enclose a certified true copy of the MOD
Instrument Rating Form 166 relating to his/her last
instrument rating when applying for the issue of a
JAR-FCL IR.
Good luck, it's great outside