Which would include who might conduct an initial test
then you state:
Which also means that if Part-FCL changes (as per condor17 Post 4) then any relaxation will instantly apply for National testing as well.
So as Part FCL only specifies that certain tests are to be conducted by nominated Examiners, them the CAA must be acting illegally in respect of the others!
It has always been the case that the CAA shall issue licences and ratings as it thinks fit; This refers largely to administrative procedures and experience requirements. The CAA are not entitled to make or change laws; they may assist government in the process. To limit an Examiner's privileges requires more than a note in a variety of guidance or information documents. To change the status quo they will need to conduct a regulatory impact assessment, provide a safety case and make appropriate recomendations to government, none of which has been done because it is an expensive and lengthy process with no safety case to justify it.
Note also in CAP 393
Air Navigation: The Order and the Regulations
Published for the use of those concerned with
air navigation, but not to be treated as authoritative
(see Foreword)
CAP 393