When I were a lad a century ago, we used to stick playing cards into our bike spokes with a clothes peg to make cool sounds, sort of like a mini motorbike. I always wondered why no enterprising company had produced a ‘proper’ device for making same – but now they have. The Turbo Spoke. It may be annoying to some, trivial to others, but I suspect that it could also save lives or avoid injury in certain circumstances.

‘No batteries, no mains, just pedal power.’