I think this is some sort of pea plant (Fabaceae) as i found another specimen later with pea pods, but i cant identify it any further.
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A photograph of the fruits might help. But it need not be the case that the other specimen was the same species.
The majority of British legumes have ternate or pinnate leaves, and Lupinus has palmate leaves. What's left is Genista, Cytisus and Ulex, and it's not the latter two, and I don't think it's the first either.
Lat/Lng: 51.438, -0.943
OS grid ref: SU735715