Olicana - I believe that CPL gives you a reduction of 5 hours on your IR. I could be wrong, but a quick 'as I understand it' email to the aquarium should cover you for later. Let the CAA make accountable errors - all you will get from the FTO is a moronic grin and the 'you should have checked for yourself' homily.
LASORS 2008, LAS E1.2, page 3 states:
Credits from IR(A) Training
Holders of a CPL(A) or ATPL(A) issued in
accordance with ICAO are eligible for a 5 hour
reduction in training in accordance with Appendix 1
to JAR-FCL 1.205. The same credit can be applied
to applicants who have completed a JAR CPL(A)
modular course of training and passed the CPL(A)
skill test (and have met all requirements for CPL(A)
licence issue prior to commencement of the IR(A)
modular course), ...