Thanks for the suggestions so far. I knew Heart of Oak was not actually of the period but it is a well known song and fits the theme for the evening.

I like the monlogue Gunner Joe too, it will add a touch of levity.

Thank's Charly for the Mariners Compass, I had not seen that one before.

With regards wildlone's comment about singing, I think that more applied to whistling as a bosun's whistle was generally used to pipe orders and other people whistling could prove a distraction. The only person who was said to be allowed to whistle was the cook, if he was whistling he could not be scoffing the food he was preparing.

Thanks again folks, I will let you know what I am going to use and also let you know how it goes. In keeping with the nautical PC, any French guests will be called 'Blue'