A CB set is a useful bit of kit when the convoy is spread out, mobile phone signal has disappeared or you simply need vehicle-to-vehicle comms that everyone can use. But do CB radios need a licence in the UK? For most people using modern, compliant CB equipment on the permitted bands, the answer is no. CB is licence-exempt, not regulation-exempt.
That distinction matters. You do not need to apply for an individual Ofcom licence or use an amateur radio callsign, but your radio, its settings and the way you operate it must meet the UK licence-exemption rules. Get those basics right and CB remains one of the simplest, most practical ways to keep in touch on the road, green laning or at a fixed base.
Do CB radios need a licence in the UK?
A compliant CB radio can be used in the UK without an individual licence. The licence exemption covers specified CB frequencies and technical limits, provided the equipment meets the relevant requirements.
For the majority of mobile and homebase users, this means a proper UK-spec or European multi-standard CB radio set to the correct UK mode, used with an appropriate aerial and sensible installation. No form to complete, no annual fee and no examination.
It does not mean that any radio sold as a CB can be switched on anywhere. Some imported radios include frequency bands, channel plans and power settings intended for other countries. Some export models are capable of transmitting well outside legal UK CB allocations. A radio with a country selector can be particularly confusing: selecting the wrong band can put you on frequencies that are not licence-exempt for CB use here.
If you are buying a first set, choose equipment intended and supplied for legal UK CB operation. That avoids the common headache of trying to work out whether an unfamiliar band letter, expanded channel block or power menu is lawful.
What makes a CB setup legal?
The key point is that the whole transmitting setup must stay within the permitted conditions. Those conditions cover more than the radio body on the dashboard.
Use the correct CB frequencies and modes
UK CB use is centred on the 27 MHz CB allocation. Modern sets commonly offer the 40-channel European CEPT FM band, while many multi-standard radios also include the UK 40-channel band. Certain compliant radios can also offer AM and SSB operation where the applicable UK conditions allow it.
The exact bands, channels and permitted modes depend on the radio specification and current Ofcom rules. A set may display far more channels than you can legally transmit on in the UK. Never assume that a channel is permitted just because it appears on the display or because you can hear activity there.
There is also a 934 MHz CB allocation used by a smaller number of operators. It has its own channel plan and equipment requirements, so a 27 MHz radio is not a substitute for a 934 MHz set, and vice versa.
Stay within the power limit
Standard CB radios are designed around modest legal power limits. This is deliberate: CB is a short-range service, not a substitute for amateur radio or a high-power commercial system. A well-sited aerial, correctly matched to the radio, usually makes far more difference to usable range than chasing extra watts.
Do not fit a linear amplifier to a CB transmitter unless you are certain the complete arrangement remains lawful under the relevant licence conditions. In normal UK CB use, adding an amplifier is likely to take the station beyond the permitted output power. It can also create interference, damage equipment if the aerial system is poor and attract attention for all the wrong reasons.
The same applies to modifications marketed as opening up a radio, increasing power or enabling export frequencies. Owning equipment and transmitting outside permitted conditions are different matters, but transmitting on unapproved settings is not a sensible gamble.
Use compliant equipment
Buy from a specialist supplier and look for a radio intended for the UK market. That gives you a much better starting point than an unknown import with vague paperwork and a menu full of unfamiliar standards.
A compliant set should be used as intended by its manufacturer. Avoid internal transmitter modifications, do not defeat power controls and use a suitable power supply. If you are fitting a radio in a vehicle, make sure the wiring is fused correctly and routed safely. A loose live feed or poor earth is not just an installation issue – it can create noise, unreliable transmission and a genuine safety risk.
Fit and tune the aerial properly
An aerial does not need a separate CB licence, but it is central to legal, reliable operation. A badly matched aerial can cause high SWR, reduce transmit performance and put strain on the radio’s output stage. Turning up the mic gain or adding power will not cure it.
For a 4×4, the best mounting position is often a compromise between ground plane, height, clearance from branches and the practical reality of tailgates, roof racks and spare wheels. A whip mounted low on a rear carrier may be tougher off-road, but it can lose performance compared with a properly mounted roof aerial. There is no single right answer, but there is always a reason to check SWR before regular use.
At a homebase, the aerial needs sensible positioning away from people, power cables and other antennas. Larger external installations can also raise planning, landlord or site-permission questions. Radio rules are only one part of putting up an antenna.
CB, amateur radio and PMR446 are not the same
Confusion often starts when different radio services are treated as interchangeable. They are not.
CB is licence-exempt when used within the CB terms. Amateur radio requires the operator to hold the appropriate amateur licence, even if the radio itself was easy to buy. Programming amateur frequencies into a handheld does not make them available for casual use.
PMR446 is another licence-exempt service, usually associated with small handheld walkie-talkies. It has strict equipment rules, including the type of antenna and maximum power. A detachable-aerial handheld radio programmed to PMR frequencies is not automatically a legal PMR446 radio.
Business radio systems can have their own licensing arrangements, and marine VHF has separate rules again. If your work, club or event needs guaranteed coverage, private channels or higher-power operation, CB may not be the right tool. For an off-road day, a road trip or a local group that needs straightforward comms, it is often exactly the right tool.
Practical operating rules that keep CB useful
A licence-exempt radio still deserves good operating manners. Keep transmissions short, listen before calling and move away from a busy calling channel once you have made contact. Use clear plain language, especially when giving directions in a convoy.
Avoid music, deliberate interference, abusive transmissions and unnecessary chatter over someone else’s conversation. Do not use CB to pass confidential information: CB is an open radio service, and anyone within range can listen. The same warning applies to personal details, access codes and anything that would cause trouble if overheard.
For convoy use, agree a channel before setting off and check every vehicle can hear and transmit before leaving the meeting point. A simple radio check can expose a loose coax plug, flat vehicle battery, incorrectly selected band or aerial fault while it is still easy to fix.
Common questions about CB licences
Do I need a callsign for CB?
No. CB users do not need an Ofcom-issued callsign in the way amateur radio operators do. Many users have a handle or vehicle name for everyday chat, but it is not a legal callsign.
Can I use a CB radio while driving?
The licence exemption does not override road traffic law. Do not handle or adjust a radio in a way that distracts you from driving. Fit the microphone and radio securely, set the channel before moving where possible, and keep your attention on the road or trail.
Can I use an old CB set?
Possibly, but check it carefully. Older UK FM rigs, converted equipment and vintage sets may not match current licence-exempt technical requirements. A modern compliant radio is usually the simpler option, particularly if you want compatibility with other vehicles using current multi-standard sets.
The sensible approach is simple: start with a compliant UK-spec CB radio, fit a decent aerial, set the correct band and have the installation checked before relying on it. If you are unsure about a particular set, aerial or power arrangement, CB Radio UK can help you choose equipment that suits the way you actually use your vehicle.