I saw a red flag flying at the back of one of those boats, it had what looked like a union flag in the top left corner, I'm sure I have seen one of those before but it was a long time ago.
There was also a comment about sailors leaving to look for wealth and adventure or some such nonsense, the only thing sailors ever look for is beer and girls (or beer and boys for some).
Great video though, a great find, thanks for posting.