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..leaves and phyllaries please? Could be pseudo-radiate C. nigra, but can't tell without more info.
This plant was so close to the ground that it was impossible to photograph anything but the flower....
..describe features, if it's not possible to photograph them. What was it that led you to an ID of C.nigra rather than C. scabiosa?
On reflection this does look like C.Scabiosa from the flower pattern.
Lat/Lng: 51.0169, -1.9336
OS grid ref: SU047241