Leucanthemum vulgare (syn. (old name)Chrysanthemum leucanthemum) hardy perennial
Tall white daisies with a yellow centre in midsummer; nectar for butterflies, bees, hoverflies and other beneficial insects.
This really is a UK wild flower and looks great with grasses, poppies, cornflowers etc. in a wildflower meadow.
Sow in autumn or spring in seedtrays and pot on til good sized plug plants before planting out in a field.