OK, here is what I got back from the CAA today. This helps clear things up for me.
I can confirm as per JAR-FCL 2.285 (amendment 3) the holder of a CPL(H) and IR(H) satisfies the knowledge requirements for the issue of an ATPL(H).
The above is also noted in JAR–FCL 2.050 Crediting of flight time and theoretical knowledge (amendment 6)
(11) The holder of a CPL(H) and IR(H) gained under previous amendments of JAR FCL 2 up to and including Amendment 3 is credited with the theoretical knowledge
requirements for ATPL(H) and IR(H).
Safe flying!!