A person is guilty of an offence if, during any period in respect of which he has given a written undertaking in pursuance of the immigration rules to be responsible for the maintenance and accommodation of another person—
he persistently refuses or neglects, without reasonable excuse, to maintain that person in accordance with the undertaking; and
in consequence of his refusal or neglect, support under any provision made by or under this Part is provided for or in respect of that person.
A person guilty of an offence under this section is liable on summary conviction to imprisonment for a term not exceeding 3 months or to a fine not exceeding level 4 on the standard scale, or to both.
For the purposes of this section, a person is not to be taken to have refused or neglected to maintain another person by reason only of anything done or omitted in furtherance of a trade dispute.