Excellent diagnostic skills and superior knowledge from a talented and multi-qualified mechanic and me.
The first clue was an increasing temperature inside the moving vehicle, despite the climate control being set to 22°.
The next indicator was the formation of perspiration upon our brows, after the fan speed had been increased and the temperature decreased by 2°.
The clincher was a visual, under-bonnet inspection. On the top radiator hose, where it passes the compressor, was a fresh track of foreign material. The compressor was hot enough to burn my highly qualified companion's fingers, to which he uttered the technical term "Gosh, that's jolly hot!"☆
The starter motor lacked the grunt to turn the engine over. The compressor clutch was not concentric with the shaft.
Cold water and a repeated hammering with a pair of fencing pliers de-siezed the clutch. This allowed the the starter to fulfill its role once the air con had been turned off.
The diagnosis was the clutch bearing was toast, melting the compressor seal.
The prognosis was "It's ****ed."
Following the experienced workshop formen's adage, "The closer to home, the cheaper the tow." We headed back. We arrived home with the windows down and a bit hot under the collar.
I can understand how this problem could baffle a a less qualified individual, but it goes to show, even a Land Rover is no match for a mechanic with twenty years experience in the Military.
☆Paraphrased by myself in non technical lingo.

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