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Looks to me like Common Ragwort - Senecio jacobaea, though it would have been good to see the foliage more clearly.
This appears to be Common Ragwort. Poisonous to all livestock. I agree with Phil above that it would be useful to have some more photos to demonstrate what the leaves look like etc.
Definitely ragwort, but as stated above, a clearer photo would be needed for a more definite i.d .. also as Rae Weaver points out it is highly toxic to all livestock in it's living form and dried in fodder so very dangerous to have growing in and around pastures. However it does provide vital habitat to over 30 species of invertebrates and it is an important source of pollen for many declining species. Certain species of moth rely heavily on ragwort, these include the Cinnabar Moth, the Ruby Tiger Moth, the Goldenrod Pug Moth, and the Sussex Emerald Moth. A loss of these species will have a knock-on effect on other species such as bats....
I don't mind removing my agreement if it is 'mistaken identity'. Regards
Lat/Lng: 52.9704, -3.168
OS grid ref: SJ216420