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This is not Hairy Tare as the flowers are too big, but what it is escapes me for now! It does not look right for Smooth Tare either.
Would you have any pictures of the flower close up,seed pod if any and a separate picture of the leaves and does it have a tendril at the end.I think it look's more like bush vetch but would need more photo's to confirm.
two more photos which I hope helps I didn't see any seed pods but can go back to see what I can find. Don't think it's Bush Vetch. I used Kebel Martin's Concise British Flora which says the tendrils on Hairy Tare are branched which, as not mentioned for the others, I presumed was diagnostic.
Howardian Local Nature Reserve
I posted hairy tare a few weeks ago and the flowers are very pale lilac and tiny the leaves are also much smaller in groups of 4-10 pairs ending in a branched tendrils and they have two seeds per pod.Had a look and zoomed in on new pics you've added but cannot find a seed pot,sorry no further forward,if you do find one it would be hairy and have two seed's in it,you can tell if you hold it up to the light if there not fully formed yet.
I've looked at your, and other, Hairy Tare and can see this isn't it, smaller flowers as you say. I posted Smooth Tare http://www.ispot.org.uk/node/157562?nav=users_observations form the same day, this was nearby do you think that it could be Smooth Tare with flowers still to open fully ?
Lat/Lng: 51.5, -3.2
OS grid ref: ST2079