Oxeye daisy
Leucanthemum vulgare
Flower: one flower structure per stem, like a large daisy, yellow centre with white petal like ray-florets around the edge.
Leaves: a rosette of deeply lobed basal leaves with long stalks, and smaller stalk less leaves further up the stem.
Height: 20-70 cm tall.
Distribution: found on grassland, meadows and wasteland.
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Oxeye daisies (F Hutchinson/WTML)
Not to be confused with

Daisy
Daisy (Bellis perennis) is smaller, less tall and the white petal like ray-florets are often tinged purple at their tips. (M Barton/WTML)
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Scentless Mayweed
Scentless mayweed, has thin-lobed, dill-like leaves unlike Oxeye daisy. (northeastwildlife.co.uk)