Long rooting runners aid its spread in lawns and grassy places.
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The flower goes with the leaves immediately below it, not the ones above and left, hence the confusion!
I agree; identification is confusing when you find the stalk is leafless to ground level apart from a small damaged leaf. I have kept the plant as a specimen and will go along with F. verna. Thanks for your help.
Lat/Lng: 53.3, -2.9
OS grid ref: SJ4088