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 drawn, cannot be heard unless it be out of tune, and the addition of the open and gemshorn is inappreciable. The thrill is, of course, due to the splendour of the reeds, and the admirable blend of the mixture: a result which the builder knew so well how to obtain."
Willis thought that the Swell 16' Contra Posaune was the finest he ever made. It is certainly a remarkable instrument.
Andrew Caskie