Williams v Roffey Bros. - The Student Room
Note that one may not be successful in arguing that since Roffey Bros. had only paid 20,000 pound to William hence it was reasonable for William to just carry out services worth of 20,000 pound. This si because it was William himself that suggest this quotation to Roffey hence he should not then later came back to argue that the money being paid by Roffey (20,000) was too little and it was unable for him to operate with a profit since he was given the chance to suggest the quotation, not Roffey. One must also take note of the decision of Ward v Byham which was being cited under Williams v Roffey Bros as it is a supporting decision which act as a catalyst which have persuaded the judges to reognise the practical benefit under William v Roffey Bros..
Williams v Roffey Bros  | Case Summary | Webstroke Law
Confusion may then arise over the reasons why is it that the claim under Stilk v Myrick was not being allowed but the claim under Williams v Roffey Bros. was allowed since both parties were merely carrying out their existing contractual obligation and if the doctrine of judicial precedent were to apply, Williams v Roffey Bros. should have followed Stilk v Myrick case. The issue was resolved under Williams v Roffey Bros & Nicholls (1990) 1 All ER at 526 by way of obiter dictas per Purchas LJ on grounds of public policy.
In conclusion, it is important that the case of Stilk v Myrick was not being overruled by virtue of Williams v Roffey Bros., but rather it was being distinguished.