19In the preceding provisions of this Schedule—
(a)" accounting year " means the period of twelve months ending with 31st March in any year except that the first accounting year of the Commission shall, if the Secretary of State so directs, be such period shorter or longer than twelve months (but not longer than two years) as is specified in the direction ; and
(b)" the chairman ", " a deputy chairman " and " a member " mean respectively the chairman, a deputy chairman and a member of the Commission.