Sea mayweed (Tripleurospermum maritum) is a classic daisy in appearance. It is much larger then the lawn daisy, of course, but it has that yellow centre surrounded by an array of white petals. On the surface, very similar (and closely related) to scentless mayweed which is a very common flower of arable farmland but the fact that this grows near the sea on the upper reaches of the shoreline on sand or pebbles, often at the base of cliffs, that can be a pretty definitive guide to identification without resorting to a hand lens.
Not a common plant, more 'occasional', but you can easily find it at places like Ringstead, West Bexington, Worbrarrow, and Kimmeridge. It is also known as sea chamomile as when you crush the leaves there is a hint of the scent that one gets from its relative, chamomile. It has similar health properties to chamomile too being an effective skin soother and its antioxidant properties help to reduce skin inflammationSea Mayweed: the sea chamomile