This grower is sure of this plant identification.
Happily self-seeds everywhere even in heavy clay. Good ground cover. If your garden hasn't been invaded yet, get in touch. I usually have spares.
Lady's mantle, Alchemilla grandiflora hort.
Alchemilla mollis (Lady's mantle). This is the most widely cultivated species. It is a low-growing, clump-forming perennial with soft grey-green, fan-shaped foliage. Sprays of tiny pale yellow flowers are produced in the summer.
These plants will often self-sow and you should remove the flowers before they set seed, if this becomes a problem.
Border, edging, ground cover, cut flowers and walls. Summer interest.