Snowdrop
Galanthus nivalis
Flower: drooping white flower, one per stem, the inner flower segments have a green patch towards the tip.
Leaves: blue-green leaves, narrow basal leaves.
Height: 15-20 cm tall.
Distribution: found in woodland and hedgerows.
Not to be confused with: cultivated varieties.
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Snowdrops (K Leslie/WTML) -
Look for the green, upside down v-shaped, marking when the flower opens (Margaret Barton/WTML)
Not to be confused with

Snowdrop cultivated varieties
Cultivated varieties often have different green markings (Ros Drinkwater/Alamy)