I was a little imprecise in my first post so worth taking a moment to update (though I see another member is already ahead of the game). The initial ERAD failure was attributed to the differential in the ERAD and I was told that diff was replaced. The symptoms of that were quite staggering - anytime the car tried to engage the electric motor it was juddering and jumping so as to be nearly undriveable. AA seemed to know nothing about it whatsoever but Spirit Volvo quickly diagnosed and the car seemed right as rain after the fix.
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