The mountings were made by Baker Perkins.
The 17/25 Pdr Mounting
A.I Baker recalled - "Early in 1943 we were asked if we would collaborate with the Armament Design Department and the Director of Naval Ordnance in getting out drawings for a heavily armoured turret which was known as the 17/25 Pdr Mounting. This was designed for mounting on a special landing craft and in effect was like a very large floating tank, its purpose being to blast out pillboxes in amphibious operations. This job was extremely urgent and we agreed to help. In August the drawings were finished and we were given an order to produce a number of mountings. We were to push two Pilot Models ahead and in December 1943 we produced our pilots. Certain small troubles were experienced with these but they were quickly overcome and we went into full production in April 1944".
Jim Deboo recalls one of the "certain small troubles" noted above. Apparently, the baseplate for this mounting required many hours of machining - with a labourer constantly in attendance to take away the swarf. When complete, because of the urgency, the Navy insisted that they would fit the mounting but forgot to fit a very important cam, with the result that, when traversing through 360 degrees, it shot its own bridge away!
Production ceased at the end of the war when a total of 78 had been completed.
I wonder if time has confused the 17/25 pdr Pheasant with the Naval mounting or if it was referred to as such to act as a cover!
The story here.
http://www.westwoodworks.net/HowItWa...ksInWW2/08.htm