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... has leaves with rather truncate apices and a distinct mucron. I can't convince myself either of the latter's presence, or of its absence.
Ignoring the red coloration as an artifact of the recent unusual weather conditions, I still have the impression that the stems are too stiff/robust for black medick.
However I can't offer an alternative identification with any confidence. (Ononis crosses my mind, but it's not a plant I'm familiar with.)
Lat/Lng: 52.3, -2.6
OS grid ref: SO6375