70. Subject to the provisions of any rules of court or county court rules, on every taxation of costs in respect of any contentious business, the taxing officer may—
(a)allow interest at such rate and from such time as he thinks just on money disbursed by the solicitor for the client, and on money of the client in the hands of, and improperly retained by, the solicitor; and
(b)in determining the remuneration of the solicitor, have regard to the skill, labour and responsibility involved in the business done by him.]