LASORS is Guidance and does not take precedence over the ANO! Schedule 3 is quite clear and has been there for decades! How do you obtain the necessary Certificate of Test, Experience or Revalidation based upon "Differences" training?
the holder of the licence is not entitled to perform any of the functions to which the licence relates unless the licence includes a valid medical certificate"
Quite right, but a Skill Test is a demonstration of skill that can be demonstrated perfectly well without exercising any of the functions to which the licence relates. They are separate items where you cannot use one without the other. Nothing more than that.