20. In this regulation and in regulations 21 to 26—
“claim” refers to a claim made under section 31 of the Act (claim for repayment of AL which was not AL due);
“reimbursement arrangements” refers to any arrangements for the purposes of the claim which—
are made by the claimant for the purpose of securing that he is not unjustly enriched by the repayment of any amount in pursuance of the claim; and
provide for the reimbursement of persons (recipients) who have for practical purposes borne the whole or any part of the cost of the original payment of that amount to the Commissioners;
“relevant amount” refers to that part (which may be the whole) of the amount of the claim which the claimant has reimbursed or intends to reimburse to other persons (recipients).