"19.–(1) Tribunal rules may make provision allowing the Tribunal to order that interest is payable on any sum awarded by the Tribunal... (2) That provision may include provision- (a) as to the circumstances in which such an order may be made; (b) as to the manner in which, and the periods in respect of which, interest is to be calculated and paid."
"(1) If it imposes, confirms or varies any penalty under Part 1 of the 1998 Act, the Tribunal may, in addition, order that interest is to be payable on the amount of any such penalty from such date, not being a date earlier than the date upon which the application was made in accordance with rule 8, and at such rate, as the Tribunal considers appropriate. Unless the Tribunal otherwise directs, the rate of interest shall not exceed the rate specified in any Order made pursuant tosection 44 of the Administration of Justice Act 1970 . Such interest is to form part of the penalty and be recoverable as a civil debt in addition to the amount recoverable under section 36 of the 1998 Act."
"[13] In our view, the basic principle applicable under [Rule 56] of the Tribunal Rules is that an undertaking which has been subject to a penalty for an infringement of the Act, which by virtue of section 46(4) of the Act obtains the automatic suspension of the obligation to pay the penalty by appealing to this Tribunal, should not obtain any benefit from the delay inherent in the appeal process. The provision as to interest on penalties to be found in that Rule is mainly there to prevent appeals being introduced merely to delay payment. It follows that the rate of interest should reflect the benefit derived by the appellant from the suspension of the obligation to make the penalty payment. A convenient measure of that benefit will normally be the appellant's cost of borrowing. In the Commercial Court, as we understand it, the normal rate applicable is Bank base rate plus 1%, although that presumption can be displaced. That seems to us, absent any evidence to the contrary, a reasonable yardstick to apply in most cases. [14] …in our view, the power in [Rule 56] to order that interest should be applicable to the penalty is not there as a further sanction in respect of a possible continuation of the infringement, or as an indirect means of securing some kind of counter balancing compensation. The interest rate mechanism under [Rule 56] is there primarily to deal with the fact that the penalty has not been paid…"
"As regards the rate of interest on the penalty, in its judgment in [ Napp: Interest and costs ]...the Tribunal held that the rate of interest should normally be 1% above bank base rate. There is no serious contest that there is an appropriate rate in this case. We think that, technically speaking, the rate in this case should be 1% above the base rate of the Bank of Scotland…"