Advertising for Prostitutes is an offence under Section 18A of the Summary Offences Act 1988 which carries a maximum penalty of 3 months in prison.
To establish the offence, the prosecution must prove beyond reasonable doubt that you published, or caused to be published, and advertisement for a prostitute.
An ‘advertisement for a prostitute’ is one that indicates, or can be reasonably taken to indicate:
You are not guilty if you are able to satisfy the court, ‘on the balance of probabilities’, that you had lawful authority to engage in the conduct.
Duress is also a defence to the charge.