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Is it birds foot trefoil?
If you look at one of these flowers you will see it looks like a very small pea flower - the leaves look rather like clover (trifoliate).
Ladies bedstraw has flowers about the same colour of yellow but they have four petals in a cross shape. The leaves are rather needle-like and come out from the stem in a "whorl"
Hope this helps
Lady's Bedstraw is one of the Galiums, which have more-or-less long thin (lanceolate or linear) leaves arranged in whorls around their stems. Galium verum is the name, if you want to look it up.
Your plant here has leaves in sets of three (trifoliate) which puts it in the Pea family, with clovers and - you are right - trefoils.
Bird's foot trefoil (Lotus corniculata) has single flowers, held on one side of the flowering stem, whereas Lesser Trefoil has rounded flower-heads, more like clover.
Hope this helps!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 50.7429121, -2.7461314
OS grid ref: SY474939