(1) The fee payable by the holder of a certificate issued under section 6 (scientific procedure establishments) of the 1986 Act shall be determined as follows.
(2) In respect of the period of twelve months beginning on 1st April in any year, there shall be a fixed and a variable element of the fee.
(3) The fixed element for such a certificate which is in force for the whole or any part of that period is £170.
(4) The variable element is £153 for each person who during the whole or any part of that period holds a personal licence which specifies the establishment to which the certificate relates as the place where the licence is primarily available.