Pale Pink-sorrel - Oxalis incarnata
Similar to Wood-sorrel, but unlike Wood-sorrel, when the Pale Pink-sorrel flower is open, the petals flare outwards. The single flowers on single stems are a pale lilac, almost white. There are no yellow markings on the inner of the petals. The bright green leaves have three heart shaped leaflets.
Other Oxalis

It has aerial erect stems, bearing leaves. Most other pink or white flowered species have leafless petioles or peduncles arising from a rhizome or bulb
A specimen should be retained for verification
Sometimes found as a garden escape and close to habitation, it may persist, at least for a while, on waste ground, walls and verges.
Flowering June to September.
Perennial – the flowers only open fully in full sun.
Widespread but not often recorded as a wild flower in Britain.
Rare or rarely recorded as a wild plant in Leicestershire and Rutland. It was not recorded in the 1979 Flora survey of Leicestershire.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015