5. Where a judgment debt carries interest, the rate of interest shallbe the rate for the time being specified in section 17 of the JudgmentsAct 1838(1).
1838 c. 110; power to amend the rate of interestspecified in section 17 was conferred by the Administration of JusticeAct 1970 (c. 31), section 44 and the relevant amending instrument is S.I.1985/437 which provides for a rate of 15 per cent per annum.