There must be lots of instructors and (particularly) examiners who operate as self-employed, or own a company for which they are the only employee, so how are these people supposed to obtain a CRB check should they want to?
From the Act Para 6:
6 Regulated activity providers
5 (P) is not a regulated activity provider if he is an individual and the
arrangements he makes are private arrangements.
Thus examiners make private arrangements with individuals and as this is NOT a regulated activity so the Act does not apply to them!