...ECU sent off Monday as above. Received back this morning, flashed and "polished" (a bit of corrosion on PCB). Included a report on communication with other modules (or rather, fault codes indicating failure to communicate with other modules, since it was presumably tested in isolation, but it proved it was attempting all it's prescribed "talking").
Re-installed. Additional earth strap added as per a technical bulletin someone had referenced. All temporary/transient codes across all the 'van's ECUs deleted, and job, for now, looks a good 'un.
Patently, much depends on whether there is a recurrence, and at what horizon, but for £60 plus my postage out, it's worth a punt. (Main dealer quotes appear to be in the £450 to £750 range).
Re-installing was slightly easier than removal (since I now knew a bit more). One minor issue was that, though I informed my tracker company of battery isolation when I removed it, I forgot to do so when re-installing.
I got a 'phone call less than a minute after removing the battery earth connection, which was embarrassing and reassuring in equal measure.
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