Clive George wrote:
What needed fixing?

It was electric, and the traction battery had had it. Which is not
something you can tell outwardly, only by reading the codes or looking at
the battery voltages with an OBD tool over a charge/discharge cycle.

(I must price up the replacement, because it might be useful negotiating
ammunition. It might have been worth it if I'd got a price that compensated
for the repair cost)

Theo