[3] The 1794 Brice Seede organ at Powderham Castle is still extant, albeit slightly modified.
[5] The 1830 John Smith organ in the Lord Mayor's Chapel in Bristol is another survivor, with modifications by Vowles and Percy Daniel.
[6] [7] Vowles was trained as an organ-builder by Joseph Monday (also spelt Munday), whose daughter he married.
[8] A survivor, although much modified by Roger Taylor in 1997, is the 1707 Renatus Harris organ in Christ Church, Bristol, rebuilt by Vowles in 1869 and 1889.
[9] The church describes the organ in its current specification as "immensely satisfying to play".