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I entered 'Polygala sp.' as it may well be P. serpyllifolia, but Ispot seems to have changed this to 'Polygala vulgaris' for some reason
You could try adding a revision and just entering 'Polygala'. I-spot should allow you to do that.
The other thing you could do is wait and see for a few days. If someone agrees that it could be heath Milkwort, they will add a revision and hopefully add some notes on why they thought it was that species.
From your pictures, I decided to agree with Common milkwort because it matches with ones that I have seen locally. However, they are very similar...
Lat/Lng: 56.885, -6.137
OS grid ref: NM480846