Where in any particular levy year, a body regarded by the Authority as fully representative of a category of financial institutions, offers to make a consolidated payment of levies on behalf of that category in terms of an agreement concluded between such category of the financial institutions and the body, the Authority may accept such offer, if the payment is made in accordance with the provisions of this Notice: Provided that if for any reason such consolidated payment is not so made on the relevant dates of payment, every individual financial institution concerned shall remain fully responsible for the individual payment payable by it, and interest (if any) on that amount calculated in accordance with paragraph 24(2).