Ian:

If you google

"only when the bastard's out of sight"

you will be taken to a page that looks like this:

ETCETERA By John Simon on Broadway.com: Sail Away - Original ...and the purser's sarcastic instructions to the cabin boys, "The Passenger's Always Right" ("…nurse him/ Curse him/ Only when the bastard's out of sight. ...
www.broadway.com/Gen/Buzz_Story.aspx?ci=533000 - 48k - Cached - Similar pages

noel coward songYou will find the lyrics there. I do not know how to cut and paste that kind of file. I got there with a google of "only when the bastard's out of sight" ...
www.mudcat.org/thread.cfm?threadid=111486&messages=6 - 1 hour ago - Similar pages

The Mermaid's Cowardy Custard: An Entertainment - Google Books Resultby Nöel Coward, Gerald Frow, Alan Strachan, Wendy Toye - 1977 - Biography & Autobiography - 96 pages
ONLY WHEN THE BASTARD'S OUT OF SIGHT. ALL. REMEMBER, BOYS, THE GODDAMNED PASSENGER'S ALWAYS RIGHT. (ARTIST U—who will sing Mad Dogs—has entered towards end ...
books.google.ca/books?isbn=0573680795...


Click on the third one (The Mermaid's Cowardy Custard) and that will take you to the lyrics. You will have to scroll up a bit but you'll get to the beginning. Please understand that it is a multi-part song in a play, so it doesn't LOOK like a 'normal' song lyric.