Poop deck...
...I was wondering where everyone on board went to the toilet.
And when Lady Babs was in a (semi-)unconscious state of fever are we expected to believe that Hornblower would have been attending to such matters below decks?
The captain had a privy in his cabin, while there was a head at the bow.
shareThe captain's cabin was the most logical place for a quarantine situation - it's at the stern of the ship and isolated, with all mod cons (for the time). Having said that, the captain was not really the most logical choice in terms of tending to a potential yellow fever case - it meant effectively turning the ship over to his First Lieutenant and thus neglecting his primary duties.
share<<<the captain was not really the most logical choice in terms of tending to a potential yellow fever case>>>
Not the most logical from a cold purely military perspective, but I suspect that Hornblower perceived the political fallout, and the end of his career, if the Duke of Wellington's sister were to die on board his ship, so he took charge himself.
(Of course, Sir Arthur Wellesley wasn't yet Duke of Wellington in 1807, but it made the point in the movie that Lady Barbara was a VERY important passenger.)
It was taking chance leaving First Lieutenant Bush in charge of the ship, but Hornblower trusted Mr. Bush implicitly and also knew that that the ship was fully repaired and that there were no real military threats, just a long....very long....sail home. The ship's doctor had been killed earlier, so Hornblower likely had as much medical knowledge as anyone on board.