24.—(1) An applicant in person wishing to take a practical or unitary test to be conducted by a DSA examiner shall—
(a)apply for an appointment for such a test to the licensing authority,
(b)provide the licensing authority with such details relating to himself, the licence which he holds, the preferred location of the test, the nature of the test and the vehicle on which the test is to be taken as the licensing authority may reasonably require, and
(c)pay such fee as is specified in regulation 27.
(2) Upon receipt of such details and such fee the licensing authority shall make the arrangements necessary for the taking of the appropriate test.
(3) An applicant in person for whom an appointment is made as aforesaid in respect of a class of motor vehicle in any category may neither apply as an applicant in person nor be nominated by virtue of regulation 25 or 26 of a further appointment for a practical or, as the case may be, a unitary test on a vehicle of the same class unless—
(a)the first appointment has been cancelled, or
(b)the test due on the first appointment does not take place for any reason other than cancellation, or
(c)he has kept the first appointment (whether or not the test is completed).