On 7 August 1888, less than two weeks before the authorisation was to expire, the directors of the Oxford, Aylesbury and Metropolitan Junction Railway Company received Royal Assent for a revised and cheaper version.
Den 7. august 1888, mindre end to uger inden tilladelsen ville udløbe fik bestyrelsen for Oxford, Aylesbury and Metropolitan Junction Railway Company kongelig tilladelse til en ændret og meget billigere udgave af planen.