Under the Wireless Telegraphy Act 2006 (WT Act 2006), all use of radio must be either licensed or specifically exempted from licensing. https://www.legislation.gov.uk/ukpga/2006/36/contents   Private Mobile Radio (PMR) is exempt from telegraphy licensing by Ofcom because use of PMR compliant equipment is not likely to involve any undue interference to other legitimate use of radio spectrum.   It is a criminal offence to use or install wireless telegraphy apparatus, unle