I think that the Retriever Derrick was early war, by 1944 the RE Platoon attached to an RASC Bridge Company would hold one 6x4 coles crane truck plus another for each of the pontoon platoons in the company.
These would be either Retriever or Austin K6 with a different model of crane fitted to each.
They were also available in various Field Parks and Depots.
Noel
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