Horned Pansy (Viola cornuta)
Introduction
The photograph on this page of Horned Pansy (Viola cornuta) by Anne Burgess as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Anne Burgess Taken: 22 Jun 2007
I've never seen this plant before, but Fitter, Fitter and Blamey say that it is a garden escape, and (unusually) that it is especially frequent in eastern Scotland. It is also called the Garden Viola.