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I turned off the aircon for the last hour of the drive home and the fault never recurred.
Ac compressor issue maybe... Bearing failure or simply belts are slipping. The compressor is probably driven off the same belt as alternator so would explain odd readings.
Otherwise sounds like a slipping clutch but that would not come and go.
TRA
Last clue is that with possible electrical issue in mind, I turned off the aircon for the last hour of the drive home and the fault never recurred.