This has me stumped

in Plants
I came across this little flower in the grounds of Constable Burton near Leyburn (N.Yorks) today. I feel I should know what it is but cannot bring a name to it. It was growing in a shady area. It was about 4-6" tall
A gardener's work is never at an end - (John Evelyn 1620-1706)
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Thank you for asking.