The phone goes: A narrow boat with a cargo of laydees on a birthday trip is on the way downriver. They are going for "lunch" at the Ferry Boat pub and returning later
Translation: A load of immense wimmin are getting pissed on a boat, are going to the pub to get even more pissed and sunburned and will make a chaotic return upriver at about 4.00
And lo, so it came to pass