Thank you all for your helpful suggestions
This morning I used my limited electrical expertise to isolate the batteries one by one, trying the accelerator each time I had five different batteries in the circuit.
The battery that is at the start (or end?) of the wiring and has numerous leads attached (I'm guessing lights, horn and anything else that doesn't need 36v) is the one causing the problem, and excluding that got the cart moving again.
Last time this happened I just replaced the one battery with a similarly-aged one so am hoping to do that again. Mrs Fox, however, has her eyes on a whole new set (outrageous!) Of course, that would be the sensible option, but where's the fun in that?
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