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Great photos - I've tried and failed!
I was trying to key this out in Stace, and it seemed that I needed a view of the lower leaves to distinguish the two.
I can only see alternate leaves in the photos, P. serpyllifolia has opposite lower leaves - they may be there! Is it an acid site?
I've just checked and it's limestone so very unlikely to be Heath Milkwort, which prefers acid conditions.
BSBI report also confirms Polygala vulgaris - see this excellent link
Despite occasional, unsavoury activities occurring in the woodland near the SW entrance.
The Yellowhammers here appear learned in the ways of photography, and love to pose at the extreme limit of my equipment's capabilities.
Lat/Lng: 54.68682, -1.48519
OS grid ref: NZ332325