I've been keeping an eye out for a few variations of Sweet Violets in recent days. Despite the continued lack of var. sulfurea at a site in Norwich a local walk from home produced a rather nice range of varieties. Most pleasing was the reddish form var. rosea plus the expected white var. dumetorum, a blotchy pale pink form possibly var. subcarnea and also a dumetorum with pale purple on the petal tips.
Interestingly I only found a single Early Dog Violet in flower.