The organ was originally built in the 1930s for a church in the London area. It was moved to Didcot in 1973 to replace a previous instrument. In 2001 the organ was overhauled by David Wells of Liverpool. The work included the addition of a Stopped Diapason rank and placing the Open Diapason rank outside the swell box.

The specification reads:

Subbass 16'
Principal 8'
Bass Flute 8'
Fifteenth 4'
Flute 4'
Trumpet 8'
Clarion 4'
Great to Pedal
Swell to Pedal

Open Diapason 8'
Stopped Diapason 8'
Gemshorn 8'
Octave 4'
Stopped Flute 4'
Twelfth 2.2/3'
Superoctave 2'
Mixture II
Swell to Great
Pedal to Great

Gemshorn 8'
Hohl Flute 8'
Gemshorn 4'
Open Flute 4'
Nazard 2.2/3'
Fifteenth 2'
Piccolo 2'
Nineteenth 1.1/3'
Twentysecond 1'
Trumpet 8'
Clarion 4'

5 double touch thumb pistons to Great and Pedal
5 double touch thumb pistons to Swell and Pedal
1 canceller thumb piston - Great to Pedal
1 canceller thumb piston - Swell to Pedal
1 general cancel thumb piston
1 setter thumb piston