This reminds me of the "abbreviated" Full Swell at St Bees Priory in West Cumbria (III/36 1899 Father Willis; 1906/31/49/58 Harrison & Harrison). More details at St Bees Priory organ
The organ was designed by Col. George Dixon, who wrote in 1932: "Now we come to the most remarkable feature of the whole organ. The full swell piston draws contra posaune 16ft., cornopean 8ft., clarion 4ft., flageolet 2ft., and mixture 12 19 22: but five speaking stops, and there are no couplers. This wonderful full swell effect has deceived many, yet it scarcely could be improved upon. The oboe, when dra