Gallery Inside the Iron Duke Inside the Lock Along the River Chelmer Towpath Living room and Dining Area Chelmsford Town Centre River Chelmer, Essex. A nice warm evening with the log burner running. Dining table on the Iron Duke Canal-Boat A view inside of the Iron Duke Happy Swan on the Canal looking backwards over the River Quiet day out looking over the River Chelmer, Beautiful Oak paneled interior and log burner. Exiting a Lock on the river Chelmer. Down the River Chelmer The quietest river brought me to this part of the world, there is nothing else like it! You will be hard pushed to find a Canal Boat as spacios and well equipped as the Iron Duke!