Small brown and bluish. Orange spots on wings.
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As the first reviser says, the underside rules out Small Blue; however, we also need to rule out both Silver-studded and Adonis Blues.
There is no hint of blue adjacent to the underside orange spots, ruling out Silver-studded.
I cannot determine from the upperside image whether there are black lines through the white margin, but the orange spots on the upperside forewing suggest this is not Adonis.
Lat/Lng: 51.2264, 1.2097
OS grid ref: TR242523
Roadside verge with mixed chalkland plants.