The organ at the Welsh Congregational Chapel in the London borough of Southwark is typical of the kind of instruments built by Comptons in the 1950s for the smaller church or chapel. It contains 4 ranks of pipes all fully enclosed as follows: Open Diapason, Hohl Flute, Salicional and Trumpet. The specification reads:

PEDAL
Bourdon 16'
Flute 8'
Trombone 16'
Trumpet 8'
Great to Pedal
Swell to Pedal

GREAT
Bourdon 16'
Open Diapason 8'
Hohl Flute 8'
Salicional 8'
Octave 4'
Open Flute 4'
Salicet 4'
Twelfth 2.2/3'
Fifteenth 2'
Swell to Great

SWELL
Contra Salicional 16'
Hohl Flute 8'
Salicional 8'
Open Flute 4'
Salicet 4'
Piccolo 2'
Cymbale III
Trombone 16'
Trumpet 8'
Clarion 4'
Tremulant

ACCESSORIES
3 thumb pistons to Great
3 thumb pistons to Swell
1 canceller thumb piston - Great to Pedal
1 canceller thumb piston - Swell to Pedal
1 balanced expression pedal - organ
1 balanced expression pedal - crescendo
1 ventil switch - Trumpet
1 ventil switch - Hohl Flute and Salicional
Voltmeter
Double touch canceller to each department with switch