On a cycling theme, there was a fussy customer in my local bike shop on Saturday who was suggesting the lights they had in stock were not legal.
They have the usual selection; Cateye, Lezyne, and brands I've not heard of.
The manager of the shop patiently explained to the customer that what he had read online was probably a mis-interpretation of the legislation which says bike lights should be lit by a filament bulb.
Filament was specified to make wick lights - paraffin or wax - no longer legal.
The argument being a modern LED is not a filament bulb.
Technically, the customer may even be correct, but I don't think anyone is seriously suggesting LED bike lights are illegal.
After all that, the customer bought a £7.99 LED light - but not before he'd blagged a small bag of cheap reflectors and fixings.
We gave him those to head off another 20 minute discussion about reflector regulations.