Many moons ago I posted a picture of this lightship from the other side of the dock. Here it is again a bit closer.
The ship helped mariners enter the Humber for nearly fifty years until it was decommissioned and turned into a museum by the council. If you're thinking of visiting you will have to wait till March and go on a weekend on the other hand it is free like all our museums and art galleries. There are a few links to the ship the best in my opinion are here and here.