Hence the "ladder" of lines seen forward of the Plimsoll mark to this day. Veronica was once engaged to her cousin Freddie Threepwood, which causes Plimsoll much jealous ire. The company was based at 31-47 New Kent Road, leased from Samuel Plimsoll. The series is narrated by Samira Wiley and produced by Plimsoll Productions. This marking was invented in 1876 by Samuel Plimsoll. He warns Tipton Plimsoll about his health in "Full Moon". Plimsoll arrives to confront his nemesis, and is delighted to learn Lister is real.