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I would like to see more leaf but it looks like Ox-eye if your not sure have a google for Shasta - L. x superbum it flowers later than Ox-eye.
I'm sure those leaves are not Leucanthemum vulgare. I think Duxbury Rambler is right.
Thanks to you both. I'm sure that you're right about the Shasta Daisy. I think that the problem is that this 'country park' is full of cultivars planted by the local authority's parks department!
Lat/Lng: 53.609, -2.30277
OS grid ref: SD800125