Advertising a Premises Used for Prostitution is an offence under Section 18 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 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.