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@clubman
I think I'm suffering from late onset allergy to exhaust fumes, probably diesel particulates - at least that's what my GP thinks.
I fear that this has been caused, at least in part, by too much riding in London for too many years. Last year I was so bad that I was more or less prevented from riding at all. This year I'm quite a lot better, but not perfect. However I have made a point of riding as little as possible in central London, and generally when I go for a ride I start off in the car to get away from Willesden before I start riding. This is not how it ought to be.
One point that I would like to raise here, particularly because I haven't seen it made elsewhere, is that the majority of new car sales are now diesels. Yes, I know they've got particle filters, but as I understand it these don't work even on pm10's, let alone 2.5's. So there's not going to a huge gain from having electric cabs, when virtually every other vehicle on the road is diesel.