Seamas, rather than snipe at the CAA, you could have checked the requirements of FCL.930.CRI:
(a) The training course for the CRI shall include, at least:
(1) 25 hours of teaching and learning instruction;
(2) 10 hours of technical training, including revision of technical knowledge, the preparation of lesson plans and the development of classroom/simulator instructional skills;
(3) 5 hours of flight instruction on multi-engine aeroplanes or an FSTD representing that class or type of aeroplane, including at least 3 hours on the aeroplane, or at least 3 hours of flight instruction on single-engine aeroplanes, given by an FI(A) qualified in accordance with point FCL.905.FI(j).
(b) Applicants holding or having held an instructor certificate shall be fully credited towards the requirement of (a)(1).
Those who meet both FI (A) prerequisites for flight instruction restricted to LAPL(A) only, but also meet CRI(A) requirements, should apply for both certificates upon completion of the FI(A) course.
They may then instruct for the LAPL (as an FI), but also provide post-graduate instruction (e.g. refresher flight training) for holders of higher level licences.