kiko ) gurgled happily, sounding much like they
were saying :

But where would you stick a number plate on a bike/rider?

Ummm, rear mudguard?

Is it NL or BE or one of those countries that has a small yellow square
plate on bikes? Some EU countries have a smaller plate for mopeds, too.

However, I don't see it's a huge problem, partly since I have to have a
full size numberplate on some of my bikes, purely because they have a small
petrol hairdryer strapped to the front wheel.

Maybe use a lightweight electronic ID tag?

groan Don't give the *******s ideas...