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I read on iSpot that this is called the repousse form of Arum maculatum, in which the dark spots are indented. A paper from 1911 reports some investigations. "On the Inheritance of Pitted Leaf-Blotchings in Arum Maculatum and on Floral Variations in the Species", Nathaniel Colgan, The Irish Naturalist, Vol. 20, No. 12 (Dec., 1911), pp. 210-217
Published By: Irish Naturalists' Journal Ltd. The paper suggests that the indentation of the markings is caused by a genetic trait.

The repoussé variation, although all the variations are present here: repoussé, flat-leaved, sharply pointed, gently pointed, and various depths of "heart" at the stem end. The repoussé form is more common along the lane (drier and sunnier) and the plainer leaves deeper into the woodland edge (damper and shadier) but it's inevitably a very small sample size.
Fungi recorded in a separate observation.