A person commits an offence if, knowing that a prohibition order has become operative in relation to any specified premises, he—
A person who commits an offence under subsection (1) is liable on summary conviction—
In proceedings against a person for an offence under subsection (1) it is a defence that he had a reasonable excuse for using the premises, or (as the case may be) permitting them to be used, in contravention of the order.