- 1821 St. Mary’s opened in its original form. There was no organ. Singers and instrumentalists were situated on a gallery at the west end of the church.
- 1871 The chancel was extended and the gallery dismantled. A small organ by the local Bristol company W G Vowles was provided in the north east corner of the chancel. The instrument was presented by the Misses Mirehouse following a fund-raising bazaar at the Zoological Gardens. Subsequently this organ was enlarged by Vowles and placed in a bay on the north side of the chancel.
- 1937/38 Vowles overhauled the organ and moved it to a purpose-built platform at the west end. A detached console was provided behind the choir stalls on the north side of the chancel. Despite some minor problems of coordination between choir and congregation this fine organ sounds to advantage from this position.
- 1948 Hele of Plymouth carried out cleaning and revoicing.
- 1984 The organ was cleaned and some remedial work undertaken by John Coulson.
- 2009 Clevedon Organs (UK) Ltd took over the care of the organ. During the next few years it became clear that a major overhaul of the instrument was overdue. A formal appeal was launched in September 2018 and active fund-raising commenced.
- 2020 Anthony Hall and his team from Clevedon Organs (UK) Ltd started work on the instrument in June 2020. The work was completed at the end of November. The restored instrument was first used at the evening service on Sunday 6 December. It sounds and looks magnificent.
|Open Diapason 8′||Open Diapason 8′||Gravitas 32′||Great to Pedal|
|Claribel Flute 8′||Stopped Diapason 8′||Open Diapason 16′||Swell to Pedal|
|Bell Gamba 8′||Viola Di Gamba 8′||Bourdon 16′||Swell to Great|
|Dulciana 8′||Viola Celeste 8′||Bass Flute 8′||Great Super Octave|
|Principal 4′||Gemshorn 4′||Bassoon 16′||Swell Sub Octave|
|Flute 4′||Flageolet 2′||Swell Unison off|
|Twelfth 22⁄3‘||Bassoon 16′||Swell Super Octave|
|Fifteenth 2′||Cornopean 8′||Tremulant|
|Clarinet 8′||Oboe 8′|
Click the player to hear a selection of music being played on the organ by Richard Morgan.