@Ka26,
read this article ... this is PART-FCL, Appendix 6, page 104:
B. IR(H) — Modular flying training course
1. The aim of the IR(H) modular flying training course is to train pilots to the level of proficiency necessary to operate helicopters under IFR and in IMC.
2. An applicant for a modular IR(H) course shall be the holder of a PPL(H) with night rating, or a CPL(H) or an ATPL(H). Prior to commencing the aircraft instruction phase of the IR(H) course, the applicant shall be the holder of the helicopter type rating used for the IR(H) skill test, or have completed approved type rating training on that type. The applicant shall hold a certificate of satisfactory completion of MCC if the skill test is to be conducted in Multi- Pilot conditions.
3. An applicant wishing to undertake a modular IR(H) course shall be required to complete all the instructional stages in one continuous approved course of training.
4. The course of theoretical instruction shall be completed within 18 months. The flight instruction and the skill test shall be completed within the period of validity of the pass in the theoretical examinations.
5. The course shall comprise:
(a) theoretical knowledge instruction to the IR knowledge level;
(b) instrument flight instruction.
THEORETICAL KNOWLEDGE
6. An approved modular IR(H) course shall comprise at least 150 hours of instruction.
FLYING TRAINING
7. A single-engine IR(H) course shall comprise at least 50 hours instrument time under instruction, of which:
(a) up to 20 hours may be instrument ground time in an FNPT I(H) or (A). These 20 hours instruction time in FNPT I (H) or (A) may be substituted by 20 hours instruction time for IR(H) in an aeroplane, approved for this course; or
(b) up to 35 hours may be instrument ground time in a helicopter FTD 2/3, FNPT II/III or FFS.
The instrument flight instruction shall include at least 10 hours in an IFR-certificated helicopter.
8. A multi-engine IR(H) course shall comprise at least 55 hours instrument time under instruction of which;
(a) up to 20 hours may be instrument ground time in an FNPT I (H) or (A). These 20 hours instruction time in FNPT I (H) or (A) may be substituted by 20 hours instruction time for IR(H) in an aeroplane, approved for this course; or
(b) up to 40 hours may be instrument ground time in a helicopter FTD 2/3, FNPT II/III or FFS.
The instrument flight instruction shall include at least 10 hours in an IFR-certificated multi-engine helicopter.
9.1. Holders of an ATPL(H) shall have the theoretical knowledge instruction hours reduced by 50 hours.
9.2. The holder of an IR(A) may have the amount of training required reduced to (not "by") 10 hours.
10. The flying exercises up to the IR(H) skill test shall comprise:
(a) pre-flight procedures for IFR flights, including the use of the flight manual and appropriate air traffic services documents in the preparation of an IFR flight plan;
(b) procedure and manoeuvres for IFR operation under normal, abnormal and emergency conditions covering at least:
transition from visual to instrument flight on takeoff,
standard instrument departures and arrivals...
JR