 The chapel fell into disuse at the Protestant Reformation, and was used as a gunpowder store from the 16th century.By 1845 the chapel formed a store room at the western end of the 18th century garrison chapel, when the antiquarian Sir Daniel Wilson realised the significance of the chapel and publicised the building.The garrison chapel was demolished and St Margaret's Chapel restored in 1851–1852 with the support of Queen Victoria.