Rhododendrons

Rhododendron 'Bluebell'
unknown hybrid
Flowers: in large compact trusses, campanulate, with broadly rounded lobes, white at centre,
with a well-defined bluish purple margin and a few yellowish spots on the dorsal lobe.
Mid-May - Mid-June
Sturdy, vigorous shrub.
According to Cox & Cox (Encyclopedia of Rhododendron Hybrids 1988),another plant was introduced as 'Blue Bell'
by C.B. van Nes in 1932. They consider this to have purple blue fls with a light centre and a blotch and to be a shrub of slightly floppy habit. Both are considered to be still in cultivation.
Is this the plant in the photo?