[John Vasco]

George,
I think that is not an 'E' variant. Maybe I'm nitpicking, but that diagram shows the earliest style of Bordfunker's central rear canopy, which is the fully enclosed type. Even before the 'E' came into service in late-1940, the central rear canopy could be seen with a central cutout in it for the rear MG to be seated centrally on a permanent basis. Also, some units removed the central canopy altogether.