Gentelmen, you are overlooking the fact that the display is taking place at the Royal Agricultural Socirty of England show. England has was and still is, a net importer of food. Particullaly grain for bread making from Canada, and wood. There was a need to boost home production. For grain that meant using pasture and marginal land. For wood, well plant and wait say sixty years. The only timber about was old forest, in very difficult to reach places.
Pit props were a startigic item, for the mines and the trenches.
The only way this could be achived, especially with reduced manpower, is machinery. Again imports of agricultural vehicles were coming from the U.S. British manufactures needed to show their equipment was a good, in price and reliabilty and performance.