We have a bookcase that is six feet long. It absolutely looks like Heywood-Wakefield, but sadly, it is not. We have searched online for a wide bookcase, but have never seen one and the one we own has no HW markings to indicate that it might be.
Eventually, in addition to the straight bookcase we have, we would like to own a corner and another straight. There are many gorgeous shelving units and bookcases from Heywood-Wakefield, but unfortunately none that we can fit anywhere.