In 1991, the main work was undertaken, including the re-voicing of the stops on Lewis's original wind pressures. A Lewis Flauto Traverso rank was obtained for the Choir organ, to replace the one discarded by Willis, and the Nazard and Tierce were removed – meaning that the Great organ's Octave Quint is now the instrument's only mutation register. The two prepared for drawstops on the Pedal were also disposed of. Thus, the stop list is now as Lewis left it, except for the Viola 4' which was retained because it was a gift "".