(1) Costs specified in these regulations as payable at an hourly rate must be calculated by—
(a) adding together the total number of 15-minute units spent by the person carrying out the function (including travel and waiting in respect of the function); and
(b) multiplying the total number of units by 25% of the applicable hourly rate.
(2) To avoid doubt, a minimum charge of 25% of the hourly rate is payable if the time spent by the person carrying out the function is 15 minutes or less.
(3) For the purposes of this regulation, 15-minute unit means—
(a) a period of 15 minutes:
(b) any remainder produced by dividing the total time spent carrying out the function by 15 minutes.