Re: And this ladies and gentlemen...
Yes we do have O in number plates. O and 0 look exactly the same, as does I and 1. The only way to know which it is is to know the position of the character on the plate. They can be:
LL00 LLL (the most recent form, for plates issued since Sept 2001)
L000 LLL (from 1983 to 2001) - the number portion never has a leading 0, and can have fewer than 3 digits
LLL 000L (from 1963 to 1983) - the number portion never has a leading 0, and can have fewer than 3 digits