(1) Where an additional amount is included in costs by virtue of section 30(2) (costs payable to a member of a body or other person party to the proceedings to include an additional amount in respect of provision made by the body against the risk of having to meet the member’s or other person’s liabilities to pay other parties' costs), that additional amount must not exceed the following sum.
(2) That sum is the likely cost to the member of the body or, as the case may be, the other person who is a party to the proceedings in which the costs order is made of the premium of an insurance policy against the risk of incurring a liability to pay the costs of other parties to the proceedings.