Morris-Commercial C8 Gun Tractor body id please?

[Hanno Spoelstra]

Originally posted by David_Hayward
This appears to be, from the photo description, a C.8/P Predictor rebuild to the A/T Mk 111.

How would one be able to establish that a C8/AT was modified from a C8/P? Would the original data plate be retained?

What's the M-C truck behind with no screen?

That's a Morris-Commercial C9/B "Carrier, SP, 4x4, 40-mm AA (Bofors)" on the same site and from the same stable.