The other half has adjusted my dynamo, as advised in the comments, and all is now sweetness and (much) light. It got its first test last night, down to choir and back and didn’t even skip out as I went through the perma-puddle that guards our front gate. Instead of grinding along into my own headwind, I practically flew back from the village, the light filling the road; if anything it felt faster than riding during the day. I even had enough breath left to sing – one joy of an empty road is that you can pelt along belting out I’m a Believer (we had been doing a tribute to Davy Jones), disturbing nobody but the owls.
It’s getting the real final test tonight, though: down to the pub and back. Social life, here I come.
Following extensive field trials on the return from the pub I can report that it didn’t slow me down one bit – of course, I had made sure I’d prepared with a proper sports drink* this time. I can also report that it may need a bit of adjustment for use in the p*ssing rain. Clearly I shouldn’t advertise my movements to the Weather Gods in advance