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More thinking time has come up with Cerastium (glomeratum??) as this would better match the hairyness of the leaves. I even thought Galium mollugo but the stem looks round.
Yes, I can see what you're getting at. The stem is round. What puzzles me is that what should look like petals seem to look more like leaves. Difficult.
I don't think that they are petals but an abnormal growth of leaves - perhaps caused by damage
Lat/Lng: 54.68682, -1.48519
OS grid ref: NZ332325