Yes, you should just buy the book.

However, there is a midi file of Harriet Verrall's tune in a sub-directory here; it is an accurate transcription from RVW's notation, made by Ed Pellew back when we all thought that Penguin was unlikely ever to be republished. Locate the page devoted to the song via the search engine, and there you are. The Collins arrangement regularised the rhythm somewhat, particularly in the final bars, but wasn't, so far as I remember, greatly different.