Otherwise known as Cymbalaria muralis or Kenilworth Ivy. I photographed this plant whilst visiting Heale Gardens, Wiltshire, UK; it was growing on a low wall dividing garden areas, and also on a wall by the side of the river – attractively leaning over the water.
I like its red-green twining stems, red-edged fleshy leaves and pretty purple flowers which have yellow and white centres. I had to invest quite a bit of time trying to identify it – the usual internet searches using colours, leaf shape, number of petals and habit were producing no results. Eventually, the mystery was solved when I added ‘grows on a wall’ to the search.