Several plants in a linear group (suggesting spreads by runners?).
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I'd like to see the stem and a view of the whole plant.
Sorry, but that's the best I can do until I re-visit the site.
... it looks like Cirsium arvense. If it's not then I suggest that you consider the Carduus thistles.
Side view of flower head would be useful & a more advanced flowerhead + the main stem. I know its been said before about not going by the amount of webbing, but there appears to be rather a lot for Cirsium arvense.
Lat/Lng: 51.304164813153, -0.1786994934082
OS grid ref: TQ270576
Chalk grassland SSSI