"....
"The case is more difficult where a general payment is made and in each individual case it is a question of construction [construction of course means first and foremost looking at the document] as to whether the payment made is to be taken to have included any rights which the employee might have under the provisions of the statute. If the employer makes a general payment - particularly if it is made ex gratia - he will risk the argument that he has not paid something which is referable to the liability for the basic award should he be held to have dismissed unfairly. But it seems to us that there can be cases in which a payment is made and which is, as a matter of construction or of fact, to be taken as including such rights as the employee may have under the statute, even if entitlement to the moneys is initially denied by the employer."