The Wireless Telegraphy (Content of Transmission) Regulations 1988
These Regulations prohibit the use of a station for wireless telegraphy and wireless telegraphy apparatus as set out in regulation 3 for the purpose of sending a message, communication or other matter that is grossly offensive or of an indecent, obscene or menacing character. A person who sends such a message, communication or other matter is guilty of an offence under the Act and may be liable on summary conviction to a fine not exceeding level 3 on the standard scale.