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@Wannabe
Dynamo mystery solved (in part). When standing next to the bike, and aligning the roller on the tyre, and spinning the tyre, light was plentiful. Riding along, it dimmed out then disappeared...because the bolt holding the dynamo to the frame bracket was loose, and it vibrated downwards as I rode along, the roller eventually coming off the tyre onto the rim and not spinning but rubbing.
The back light is really vulnerable to the kickstand, which you basically have to squeeze past it every time, and still doesn't appear to be working. The wire from the dynamo has been broken and repaired extremely badly with electrical tape, so I'll sort that before trying something else.
Anyone got any ideas how to replace internally routed dynamo wires? It's just occurred to me that that particular job would be a royal pain in the arse.