Can Anyone ID These Wheels?

Do the following ring any bells with anyone….these are GA sized wheels, but very heavy (About 30 Lbs each..!) split-rims with a high ply-rating tyre currently fitted. There’s no saying that these are the correct tyres for the rims of course….! ;-

Palmer.
PR1057 (1011M).

Fitted tyre is;-
Dunlop. CONDUCTING 0906 jun 63.
18×5.5.
TypeVII.
8-Ply Rating.
DF9896 Issue 1.
(27A).

Given the modest size, I’m thinking perhaps Prentice, Provost etc, They have the drums still fitted, so they are mainwheels, – they are probably from something early post-war I think. Any leads most gratefully received….! 🙂