(1)  A costs assessor may, in an assessment, determine whether interest is payable on the amount of costs assessed or on any part of that amount and may determine the rate of interest payable (not exceeding the rate referred to in section 305 (Interest on unpaid legal costs)).

(2)  This section applies despite any costs agreement or section 305 .

(3)  This section does not authorise the giving of interest on interest.