I tried cleaning them, gapped them, no good. Dead. Almost certainly got toasted when it was running super rich (and hot). I used to get this occasionally on one cylinder on my trident - Iridium plugs sorted that out.
Been out again today, it still isn't quite right, still running a bit rich but a lot better than it was. I need to get it MoT'd so I can try a proper road test - until now it hasn't really mattered because half the time I ended up pushing it home! So not going far was for the best.
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