Brokers shall comply with the minimum scales of brokerage charges (see Section BC-4.6) agreed in consultation with the Bankers' Society Council from time to time, or laid down by the CBB. In cases where there is no established minimum scale of brokerage charges, no deals shall be transacted until a rate has been agreed. Rates of brokerage in these cases should be agreed in advance, and only by Directors or senior managers on each side, and in no event by the dealers themselves.