Though this was strictly not allowed under JAR
Not true, this was allowed under JAR "with the expressed permission in writing of the Authority". As this qualification is not included in Part-FCL, an examiner may not test a candidate to whom he has given any instruction for the licence or rating (including trial lessons and 'progress tests' if they are included in the approved syllabus) or who he has recommended for test (a formal recommendation for test is required for all but the ATPL skill test).
However, none of this comes into effect in the UK until 17 Sep as it is included in Part-FCL and not in the Cover Regulation. For now, at least, JAR-FCL 1.030(d) continues to apply.