As built, St Nicholas's had a traditional set of choir stalls on either side of the chancel and for many years there was a flourishing robed choir. An electronic organ was installed with its console behind the north-side choir stalls and the speakers on either side of the sanctuary.  This instrument proved profoundly unsatisfactory, and  was replaced around 1970 by a single-manual pipe organ built by Bevington & Sons about a century earlier, which came from the former chapel of the Royal Herbert Hospital. 

The Bevington is an interesting instrument. It was evidently built without pedals, as the pedalboard it now has is somewhat crudely grafted on (only apparent when the board is detached); it is permanently coupled to the manual by pulldowns, and there are no pedal stops. The keyboard is divided, with a 16' Bourdon acting on the lowest octave only, as does an 8' Stopped Diapason Bass.