No doubt relief can be given against the forfeiture of a sum lodged by way of a guarantee of performance on the footing that having regard to its amount relative to the circumstances of the case, it amounts to a penalty: see, for example, Public Works Commissioner v. Hills [1] where the Judicial Committee was "unable to come to the conclusion that the sum here can be taken as a genuine pre-estimate of loss". Of course in a case where the party holding the bond or a sum of money, or having the benefit of a promise to pay an agreed amount by way of assurance of performance is content to forfeit the amount of the money and take it or the performance of the promise to pay, as and for liquidated damages, and the other party is insistent that only the amount of actual damage be retained or paid, the question whether there is an implied limitation upon the amount of the damages recoverable does not arise for discussion because the underlying assumption of the contest between the parties is that the actual damages are less than the amount of the bond, or money held, or promised to be paid. But none the less, to hold that the amount of the bond or money is a genuine pre-estimate of the damages does involve an implied limitation upon the liability to pay damages. Thus, it seems to me that the appellant's counsel was right to pose the question whether the sum of £300 was a pre-estimate by the parties of the damages likely to be sustained by the lessor on any breach, including a total repudiation, of the lease and its covenants. If it is, I think a limitation upon the amount recoverable for such breach is necessarily accepted. But it is not correct, it seems to me, that, if the amount agreed be not a penalty, it must be a pre-estimate of damages. So to reason overlooks the very case with which we are called upon here to deal, namely, the case of the deposit of a sum which is neither a penalty nor a pre-estimate of damages but an earnest of performance which, on default, may be retained and credited against the damage suffered. That the sum is not punitive is obvious. That it is not a pre-estimate of damages is to my mind just as obvious. For it covers, amongst other things, the non payment of rent. In amount it does not cover two months' rent. That the parties by fixing the sum of £300 as the amount of the performance deposit agreed that, whatever arrears of rent accumulated, only that sum could be recovered more than strains credulity.