Further to the question regarding the use of shanty singing on Royal Navy ships here is a quotation from Stan hugill's 'Shanties from the Seven Seas' :-

          "No shantying was allowed in the Senior Service, although Whall seems to think that it was permitted in small craft and revenue cutters and then the only type of shanty used would be a stamp-'n'-go song suited to big crews who would walk away with married falls. 'Cheer'ly Man' was also used at times, but in the main, though they had the aid of the fiddle, the pipe and the calling of numbers by the bosun's mate, naval seamen worked in silence - hence the disparaging title given them by Merchant John - 'Johnny Haul - Taut."

So don't expect any shanty singing on Hornblower's man o' war....