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I'm not sure about 'Yvonne Hay', Arthur. It seems to be extremely variable in flowering time but mostly a good deal later. The next earliest reference I can find is here http://www.srgc.net/forum/index.php?topic=4674.0 on 14th December 2009 when some people report 'Yvonne Hay' in flower but you say yours has only just broken the surface.
Epiphany isn't autumn flowering for me
...'North Star' is one of John Sales discoveries - in his talk at the 2006 Galanthus Gala he said "Another seedling found in the garden [his garden at 'Covertside'] is similar to 'Lady Beatrix Stanley’ but earlier flowering and more star-shaped. It increases rapidly and is very free-flowering, producing dense masses of flowers, I call it 'North Star’."
G. elwesii var. monostictus from David Culp that stands out from among the ranks of 'old year' clones of this species for the shape, size and quality of its flowers, followed by amazing long foliage suggesting the name 'Blue Octopus'
'Autumn Beauty' has a narrow horseshoe green mark whilst the second clone - now named on the nursery 'Autumn Belle' - has a much wider marking.