[Geoff Rayner]

Kirche, for some unknown reason I didn't see your post #22 and responded to Nokose's #23 instead.
So, definitely a Hawker build. The PSCO inspection marks will be on parts from a sub-contractor, probably the Pressed Steel Company. Taking the seat out should not affect the identity plate, but two stainless steel tubes make a V shape from under the seat to the joint (on either side of the aircraft) where the plate is attached. Those tubes have been crudely removed and with the left side one has gone the identity plate. It is possible that unwanted parts like the identity plate might have been 'cleaned' off the more attractive stainless steel tubes and discarded if the objective was metal salvage. You might be lucky when the ground thaws, but it looks as though the stripping has been thorough; so thorough that I see no reason why the salvagers should leave behind any detachable aluminium panels either. Time will tell. PM sent.
With regards
Geoff