bazv that is a good point on the lettering almost certainly correct, I also note that vintage wings of  Canada show their Noorduyn  harvard with a similar interior  deep green as does their Oxford so very much a Canadian shade. I do however think this is part of the large removable fuse side access panel they could have put octane rating there as i think they did on american fighter IIRC, plus no  too far from fillers on wing. The steel tubing in similar green almost certainly same airframe just trying to find match.

Next photo is what I have now identified as the port engine exhaust manifold from an airspeed oxford

Then an ally air duct around part of exhaust manifold

Final pictures are of intriguing steel aerofoil shaped heat exchanger so it would have been out in the air flow  – I’m sure I’ve seen this on a big interwar biplane but i cannot find a suitable airframe. this part has 2 steel cadplated clamps  with same part no: SR 51617 with circular inspector stamp either “56” or “36”

Next photos is tubing with same deep green as inside of  trainer yellow panel. Tubing seems too flimsy for engine bearer? One bolt has “AERO” lettering on head,  also has an ally tank strap with part no.: 36 47027 31, 3? 47027 32 ASS (the ? Is a 6 or 8) , 25 47014 15. Comparing to online photos of harvard restorations I am certain these are the front and rear  cross members and straps that hold the oil tank between the engine bearers on a noorduyn built harvard

 items in haul include:

trainer yellow fuselage? Skinning cockpit area?

RAF dark earth cowl panel

DH hydromatic prop boss

Water radiator / cabin heater – see separate post

Cheetah exhaust manifold?

Exhaust cabin heat exchanger aerofoil shape

Exhaust air manifold duct

Section of tubular lighteight engine mount? With tank straps

In general nothing pointing to any one airframe!

More photos on the way