Just when I thought we had it sorted: gone back to source and this is the 'Taylor's Cottage hive' that was being referred to:
http://www.beekeepingforum.co.uk/picture.php?albumid=217&pictureid=1374
(sorry, making a hash of getting the picture in the text)
My informant says
"The picture of the cottage hive shows how its brood body has a lift above which means that the super has an outer cover. The advantage is that when the super is taken off in the autumn the lift can be turned upside down to provide a second wall for extra winter protection for the brood box." He thinks that the pictures in the forum here show not a cottage hive nor a WBC but a CDB hive, but looking on Dave Cushman's site a CDB hive is something else again! Had no idea there were so many possibilities.
Anyone written a book on the history of hives?