Hi Steve great to hear the garden is giving you some therapy. Ours is in need of some TLC... Just doesn't seem to be enough hours in the day!

The little plant you have stumbled on is an Anemone Blanda Wood Anemone... The definition:These gorgeous little wood anemones are perfect for naturalising in a mixed border, at the edge of a woodland area, or around the base of deciduous shrubs, where they shine out like jewels. For maximum impact plant in bold drifts.  A stunning little plant that lifts the spirits in spring.  Says it all....
Sending you much love Alison xxx