6.—(1) Subject to paragraph (2), nothing in this Order precludes a diocesan board of finance from agreeing to pay any sum to a diocesan registrar by way of annual fee or retainer which is additional to the annual fee payable under Table 1 of Schedule 1.
(2) Any such agreement must—
(a)be in writing;
(b)be expressed to be an agreement made in accordance with this article; and
(c)state the period for which it is to run, or, if no such period is stated, remain binding until determined by not less than three months’ notice on either side.