You may need an embassy visa for Namibia if you have a British passport
Visa options for Namibia
Visa on arrival for a maximum of 90 days for Tourism from 1 April 2025
Travelers need a visa to visit Namibia for Tourism beginning 1 April 2025. Travelers can get a Visa on arrival at Namibia’s Hosea Kutako International Airport (WDH), Walvis Bay International Airport (WVB), Walvis Bay Harbour, or any of the following border posts: Trans-Kalahari, Impalila Island, Katima Mulilo, Oshikango, Mohembo, Ariamsvlei, Orangemund, Noordoewer, or Ngoma.
This is not offered by sherpa°.
Apply on the government site.