Green heart-shaped leaves with a smooth, shiny surface.
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Maybe periwinkle? Where was it? How big were the leaves?
It was fairly close to a river from what I remember, about 10-12cm in length.
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Not sure periwinkle leaves are that big? I also thought lilac from the leaf shape - which is totally different and makes me wonder whether I've got any idea what I'm talking about at all! (Getting Hebe and Hypericum mixed up has wobbled my confidence rather, but photos just aren't the same as live plants.)
They're really not, I googled pictures of periwinkle and they looked pretty similar though.
Lat/Lng: 51.371, -0.157
OS grid ref: TQ283651