Would the Royal Navy support a peerage for someone who took the knowledge needed to make a yellow-fever vaccine back to the 1840s?
Short answerThat is uncertain for the 1840s; taking the vaccine to the 1770s, when powers were fighting over the Caribbean, prompts a much stronger expectation of exceptional rewards.
NotesA peerage for bringing a yellow-fever vaccine to the 1840s is treated as uncertain. Moving the same intervention to the 1770s changes the answer because so many powers were fighting over the Caribbean. A vaccine would have particular value amid that competition for the region. The proposed rewards become deliberately extravagant: a peerage, a lifetime pension, a permanent parliamentary seat, and the inventor's name displayed in huge gold letters on the Admiralty.