To whom should details like that be passed? - Trading Standards? - or just print his name, address and phone numbers on the forum?
On checking it looks as though what happens is that some automatic court process gets triggered if the offender is convicted of another offence within the conditional period, when the original offence is then re-assessed for sentencing. The condition is, in effect, to not get caught again!
So a 'passer-by' would have to initiate steps via Trading Standards (or maybe direct with the Police, depending on the nature of the offence) to start a second prosecution, I guess. But first you would want to be sure that a new offence had been committed.
