"The default rate applied is the Bank of England base rate plus 1.5% as it varies from time to time. This can be altered in the Calculation Options. The calculator is updated to reflect any changes made to the Bank of England base rate, and is correct as of the last change to 5.5% on 6 December 2007.
The calculator is easy to use. Put the principal sum, that is, the awarded sum or the principal debt, into the first box. Enter your start date and the end date for calculation, in the form of dd/mm/yyyy, and click on "Compute". The final sum will be calculated automatically and will appear in the "Final Amount" box. Please note that the results obtained from this calculator are for the purposes of illustration only."