19.—(1) Where, in any membership year, a payment falls to be made by a member in connection with a claim in respect of which an amount may become payable by the Secretary of State under regulation 18 (determining the amount of any payment to be made out of the Scheme), the Secretary of State may make a payment on account of any amount which may become payable.
(2) A payment on account may be made to or on behalf of the member.
(3) Where the amount of any payment on account exceeds the amount subsequently determined under regulation 18 as being the amount of payment to be made in connection with the claim, the excess is recoverable from the member.