CB radio is mentioned above, a licence is no longer required AFAIK, it comes under general licence.
Are CB radios legal in the UK?
CB is now legal in UK but users must abide by the regulations for frequencies, mode, power and equipment.
Since 2006 CB Radio, using FM mode was legal without a licence being required.
This Licence "Exemption" was increased to include use of AM and DSB/SSB signals in 2014.
https://www.red-radio.co.uk/CB-Frequencies#:~:text=CB is now legal in,DSB/SSB signals in 2014.