Not sure if I am correct, so would appreciate some feedback.
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Flowers look wrong to me more like lesser trefoil.
This species is identified by the stalks on the 3 leaflets being equal (very short), rather than a longer stalk on the terminal leaflet. I can't pick this out in the photo.
The stalk on the terminal leaflet is slightly longer. But what about the numbers of flowers per flower stalk? Less than 10 suggesting Slender Trefoil?
Having said that, my second photo (of this same plant) shows very short and equal leaflet stalks...
Stace says (1)2-6(10) for T. micranthum and (3)5-20 for T. dubium, so they overlap in flower numbers. The brackets mean "exceptionally".
The individual flowers should have short stalks in micranthum and be a darker yellow. I would plump for T. dubium.
In the second photo, the stem appears sparsely hairy; usually hairless in T. micranthum (Poland). But I agree that the leaflet stalks look equal. Why can't plants read the books!
Lat/Lng: 51.46475, -2.34515
OS grid ref: ST761740