The sun made this stand out amongst the other plants around. Leaves ending in a short point.
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I thought that 'Common Vetch' has a black blotch on each stipule and 'Common' is quite rare.
Bitter Vetch has winged stems and long-stalked racemes with over 2 flowers. You're right about the stipules of Common Vetch...but I can't clearly see one in the picture. Common Vetch is one of those species which actually does live up to its name, I think, in most Southern areas.
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Lat/Lng: 50.72035, -1.84661
OS grid ref: SZ109912