“(7) The making of a payment under this regulation shall not release a solicitor from any obligation under these Regulations to submit his costs and counsel’s fees for detailed assessment or assessment on conclusion of the case. (8) Where, after taxation or assessment, payments made under this regulation are found to exceed the final costs of the case, the solicitor or counsel (if any) shall, on demand, repay the balance due to the fund and, where the total costs exceed any payments made under this regulation, the balance shall be paid from the fund.”