Great pictures Steve!
Dump trailer axle is driven from tractor PTO too - can't make out what it says on the side of the trailer, but the French Brimont trailers used the same setup and often appeared in Renault publicity.
Interestingly, and may be member
Steelfab can confirm, Fauchaux loaders were fabricated in the UK for a time, and I think it was in the Steelfab works in Cardiff.
They made a tractor backhoe with an articulating boom, which allowed it to dig in line with the outside of the rear tyres without the need for a side-shift.
Dave. S.