Marcus,
Slightly OT but I am not 'English'.
Welsh or British are acceptable descriptors but not 'English'. As an Austrian, I'm sure you understand the regional distinctions are important.
You are correct. C.O.S.C. still only tests the movements but now they must also test any functional modules associated with the final product e.g. chronograph or perpetual calendar or chiming modules (if any) must be attached during testing.
Does anyone know if any Grande et Petite Sonnerie minute repeater has passed the C.O.S.C. ?
Regards,
MTF