On the "should have added" front I should perhaps say that I have danced cotswold morris and assorted "ceilidh" stuff both on and off ferries, also border- and clog- morris, Yorkshire longsword and just a bit of rapper. I am also well-acquainted with the boat in question, which is where I work.

Having been part of a sword set which headed swiftly towards the rails when a much larger boat leaned over a bit I would honestly and sincerely advise that dancing is not a good plan.