—(1) Whether or not any order is in force under section 108, a solicitor and his client may, either before or after or in the course of the transaction of any non-contentious business by the solicitor, make an agreement as to the remuneration of the solicitor or law corporation in respect thereof.
(2) An agreement under subsection (1) shall not provide for costs at a scale lower than that provided by any order made under section 108.
(3) The agreement may provide for the remuneration of the solicitor or law corporation by a gross sum, or by commission or percentage, or by salary, or otherwise, and it may be made on the terms that the amount of the remuneration therein stipulated for either shall or shall not include all or any disbursements made by the solicitor or law corporation in respect of searches, plans, travelling, stamps, fees or other matters.
(4) The agreement shall be in writing and signed by the person to be bound thereby or his agent in that behalf.
(5) The agreement may be sued and recovered on or set aside in the like manner and on the like grounds as an agreement not relating to the remuneration of a solicitor or law corporation .
(6) If on any taxation of costs the agreement is relied on by the solicitor or law corporation and objected to by the client as unfair or unreasonable, the taxing officer may enquire into the facts and certify them to the court, and if on that certificate it appears just to the court that the agreement should be cancelled, or the amount payable thereunder reduced, the court may order the agreement to be cancelled, or the amount payable thereunder to be reduced, and may give such consequential directions as the court thinks fit.