Denning LJ reversed the lower court decision and ruled in favour of Mr Combe. He elaborated on the rule in
High Trees House. Stating the legal principle, Denning wrote, He stated the estoppel could only be used as a "shield" and not a "sword". In the
High Trees case, there was an underlying cause of action outside the promise. Here, promissory estoppel created the cause of action where there was none. In this case, the court could not find any consideration for the promise to pay maintenance. He further stated that the
High Trees principle should not be stretched so far as to abolish the doctrine of consideration, While it may be true that the wife did forbear from suing the husband on the arrears for seven years, this forbearance was not at the request of the husband. He held that in the absence of proof of any request, express or implied, by the husband that the wife should forbear from applying to the court for maintenance, there was no consideration for the husband's promise. Moreover, even if the wife had promised to not apply to court for maintenance, there would have been no consideration, because one cannot waive the statutory right to apply for maintenance. ==References==