Photo is meant to be of the smaller leaves with the crinkly edges.
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The smaller leaves might be Nymphoides but the composite flowers at the bottom are confusing the issue!
Yes, its the smaller lily leaves with the crinkled edges I was trying to photograph (but didn't want to fall in!) - there are yellow water lilies in the photo too.
Lat/Lng: 52.6384, -1.9817
OS grid ref: SK013045
Post-industrial heathland, nature reserve managed by Walsall Countryside Services.