Paragraph 4

The invoices issued pursuant to paragraph 3 above may also include a separate amount payable by an authorised supplier representing an interest charge of 8 per cent above the base interest rate on any payment not made to the licensee by the authorised supplier on the date specified calculated for each day after the date on which any payment relating to a previous invoice or to previous invoices should have been made up to the date on which such payment was actually made.