4. After regulation 8 of the Principal Regulations the following regulation is inserted:
“9. (1) In these Regulations, a reference to—
(a) the costs ascertained in accordance with an item in a Schedule; or
(b) a scale of costs set out in a Schedule;
shall be read as a reference to those costs, or that scale of costs, respectively, increased by 11.56%.
“(2) Subregulation (1) applies only in relation to work or services the performance of which commenced on or after the commencement of this regulation.”.