How would Britain operate a command post at sea during a fictional zombie outbreak?
Short answerUse a sustainable ship with a flight deck, probably a Queen Elizabeth-class carrier, keep it offshore, and isolate arrivals on a separate ship before admitting them.
NotesA Queen Elizabeth-class carrier is the suggested offshore command post because it has a flight deck and can be sustained at sea. It would stay away from ports and avoid direct movement of people between shore and the ship. Anyone seeking admission would first spend about two weeks isolated aboard a separate decontamination ship. A longer period is raised but recognised as harsh. These precautions remain provisional because the necessary isolation period depends on how the fictional infection works.