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... I couldn't say whether this is Hippocrepsis comosa, or Lotus corniculatus or Lathyrus pratenis, both of which are commoner. In this case a view of the foliage would resolve the identification.
It may be possible to identify it by details of the flowers, but it might also require a more detailed photograph of the flowers to do so.
Sorry all the photos I have are very similar so no help there. Hopefully I will remember to get the leaves next time. Thanks for the correction on the ID. I know there is horseshoe vetch around that area - the Mill Hill website says it dominates that area so I will have another go in the future no doubt.
I think the ring of flowers around the central point is much more Hippocrepis than Lotus. Also the hint of leaves in the bottom right corner suggests pinnate narrow leaves
Lat/Lng: 50.851810833333, -0.28069833333333
OS grid ref: TQ211072