The CAA is required under ARA.FCL205 to develop an oversight system for Examiners. This it does with the aid of documents such as Stds Doc 43
ARA.FCL.205 Monitoring of examiners
(a) The competent authority shall develop an oversight programme to monitor the conduct and performance of examiners taking into account:
(1) the number of examiners it has certified; and
(2) the number of examiners certified by other competent authorities exercising their privileges within the territory where the competent authority exercises oversight.
(b) The competent authority shall maintain a list of examiners it has certified. The list shall state the privileges of the examiners and be published and kept updated by the competent authority.
(c) The competent authority shall develop procedures to designate examiners for the conduct of skill tests.
The CAA is required to produce a list of Examiners together with their privileges however; this list is only updated periodically, so it makes sense to ensure that those privileges are entered on the Examiner's own personal Certificate, which a candidate is entitled to ask to see prior to test. When testing candidates from other States, the NAA invariably wishes to see a copy of the Examiner's Certificate to determine if they are appropriately authorised. If it were not entered on the Certificate, how would anyone know?
UK Examiner authorisations have always listed the privileges of the holder to ensure that they know what they are authorised to do.