Coloured Water-lily - Nymphaea marliacea
Quite similar to the White Water-lily (Nymphaea alba), but the flowers of Nymphaea x marliacea tend to be tinted with pink or yellow whereas Nymphaea alba flowers are a more pure white. A horticultural hybrid between N alba and either N tuberosa or N mexicana, both North American species; widely planted and naturalised.
White water-lily (Nymphaea alba)

Coloured petals, often only a very slight tinge.
A photo of the flowering plant. This cannot always be determined from the leaves alone, although they are often marbled.
Ponds, lakes and canals where it has probably been introduced by humans as a result of discarded plants from ornamental ponds.
Flowers June and July.
Perennial.
Occasional in Britain, usually by means of human introduction.
Infrequent or under recorded in Leicestershire and Rutland. It was not recorded in the 1979 Flora survey of Leicestershire, and is not listed in the current Checklist (Jeeves, 2011)
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