9. The use of wireless telegraphy apparatus complying with the interface requirements [F1which form part of the publication “IR 2027.2 – UK Radio Interface Requirement 2027.2 for AM/SSB and DSB use in the Citizens’ Band Radio Service”, published by OFCOM in June 2021], is exempt from the provisions of section 8(1) of the Act, if it does not cause or contribute to any undue interference to any wireless telegraphy.