The final terms of each issue which is intended to be listed ("the pricing supplement") must be submitted in writing to the Exchange as soon as possible after they have been agreed and in any event no later than 2:00 p.m. on the business day before listing is required to become effective. The pricing supplement may be submitted by the issuer, or one or more firms designated by the issuer so long as in the latter case the Exchange has received a letter of appointment signed by a duly authorised officer of the issuer.