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Yes I think it is (Tragopogon porrifolius). Why not add it as an identification?
...Rose says "Very rare" outside of the Thames Valley.
*gets on bus to Stoke Road with packed lunch and hand lens*
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 51.951, -2.109
OS grid ref: SO926280