Sainfoins (Onobrychis viciifolia) belong to the pea family (Leguminosae/Fabaceae). My trusted Collins Complete Guide to British Wildflowers tells me that these are generally found in dry, calcareous grasslands, which is exactly where I found these growing!
All pictures with a iPhone 4S, the bottom two with an external macro lens attachment. All pictures corrected for contrast and white balance in Adobe Lightroom 5
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