Do United Kingdom passport holders need a visa to visit CM?

No, you cannot travel visa-free. UK ordinary passport holders need an eVisa for Cameroon, applied for online before travel at the official portal. There is no visa on arrival at Yaounde or Douala airports, and a yellow fever vaccination certificate is mandatory. British citizens holding an ordinary passport require a visa to visit Cameroon for tourism. Cameroon operates a mandatory eVisa system: applicants register online at the official portal (evisacam.cm), pay the fee, and receive an electronic visa authorisation with a QR code by email. The QR-coded approval is then converted into a biometric visa sticker on arrival at the airport or border (or pre-printed at the High Commission in London). The UK Foreign, Commonwealth & Development Office explicitly confirms that visa on arrival is NOT available at Yaounde or Douala airports, so the eVisa must be obtained before departure. Short-stay tourist visas can be issued for stays/validity of up to 180 days, single or multiple entry. The High Commission of Cameroon in the UK quotes a fee of EUR 153 for normal processing (within roughly 72 hours) and EUR 229 for express service. A passport with at least 6 months validity and a valid yellow fever vaccination certificate are mandatory entry conditions. Travellers arriving by road or sea must obtain a physical visa from a Cameroon embassy/high commission beforehand rather than relying on the eVisa.