Looks like a 1944-5 C60S.
All tippers (dump) on CMPs here used the C60S or F60S chassis. Looks like it has Lucas side lights so this might be a post-war picture.
We had three types of tippers mostly on Ford chassis and the later types used 8.25 20 nd tyres with duals on the rear. The capacity was 2 1/2 cubic yards.
Here's a similar angle of a rough C60S tipper for comparison:
More pics
here
Here's a Ford nomenclature plate:
