A person aggrieved by a determination made on behalf of the Secretary of State with respect to a type approval certificate, a manufacturer's certificate or a Minister's approval certificate under section 47 or 48 of this Act, including any determination with respect to design weights or plated weights, may within the prescribed time and in the prescribed manner appeal to the Secretary of State, and on the appeal the Secretary of State-
(a) shall have the like powers and duties as he has on an original application for a type approval or a Minister's approval certificate or in respect of the plated weights to be included in a manufacturer's certificate;
(b) may hold an inquiry in connection therewith; and
(c) may appoint an assessor for the purpose of assisting him with the appeal or any such inquiry.