Just raced out to check my No9... 29.Q F.A.T. 131 with C29Q being the Ford designation for an arty tractor. Looks like there may be a 'C' there too.
Great find, Wayne!
The No8 was fairly rusty in that area (and there are no tyre ramp fittings) but wlll check when I next visit it.
Colin Anderson gave me the lead and drew a map from memory. He'd last seen it 5 or more years ago.