Here are 32 pages of information on Stan Hugill's bawdy sea shanty collection:


https://www.dropbox.com/s/59ha8fah2ozy6gb/Sailing%20Ship%20Shanties%20by%20Long%20John%20Silver%20%28Stanley%20J.%20Hugill%29.pdf?dl=0


The PDF above gives an index to the unexpurgated manuscript titled Sailing Ship Shanties, by Long John Silver [pseud. of Stan Hugill] which was done in Aberdovey, Merioneth, Wales in 1956-1957 and it includes correspondence about the manuscript.   The full manuscript (not present here) has the texts of all the shanties later "camouflaged" in Hugill's Shanties from the Seven Seas.   What is present is the title page and index to the MS collection along with correspondence between Stan Hugill and G. Legman about the manuscript along with fragments and discussion of the sea shanty texts.

I do not know the location of the full manuscript. It is probably at the Kinsey Institute Library where the bulk of the Legman collection went after parts had been sold off to collectors and dealers.