Certain provisions of the contract are set out in Exhibit P1-19, the letter of 16 March 1994 from the plaintiff to the defendants. That contract is to be interpreted as providing for a fee in respect of the services referred to in the letter to be payable to the plaintiff, in the amount of 10 per cent of the value of such of the works referred to in the letter as the defendants might subsequently authorise the plaintiff to carry out. It is not necessary to decide whether there are any other and if so what terms to be implied. The contract was varied in about June 1994 by an oral agreement between the plaintiff and the defendants to provide that the plaintiff would make payments to contractors and suppliers for work authorised by the defendants, and to provide that the defendant would reimburse the plaintiff for such authorised payments.