8.3 Default Interest
(a) If the Borrower fails to pay any amount payable by it under a Finance Document on its due date, interest shall accrue on the Unpaid Sum from the due date up to the date of actual payment (both before and after judgment) at a rate which is, subject to paragraph (b) below, two per cent (2%) higher than the rate which would have been payable if the Unpaid Sum had, during the period of non-payment, constituted a Loan in the currency of the Unpaid Sum for successive Interest Periods, each of a duration selected by the Lender (acting reasonably). Any interest accruing under this Clause
8.3 shall be immediately payable by the Borrower on demand by the Lender.