Section 121

at any time before service upon him of a writ or other originating process for the recovery of costs included in a gross sum bill and before the expiration of three months from the date of the delivery to him of the bill, the party chargeable therewith may require the advocate and solicitor to deliver to him in lieu of the cost a bill containing detailed items, and the gross sum bill shall thereupon be of no effect;

where an action is commenced on a gross sum bill, the Court shall, if so requested by the party chargeable therewith before the expiration of one month from the service on that party of the writ or other originating process, order that the bill shall be taxed;

if a gross sum bill is referred to taxation, whether under this section or otherwise, nothing in this section shall prejudice any rules of court with respect to taxation and the advocate and solicitor shall furnish the taxing officer with such details of any of the costs covered by the bill as the taxing officer may require.

Subsection (1) shall not apply to fees paid to an advocate and solicitor who is briefed as a senior counsel.