Not quite sure what this is - found in the rail cutting beneath a couple of Ash trees in a shady place.
Feel free to say if you know, it could be a garden escapee, but it is a few metres from the fence.
Edit: phone app comes up with Honesty, the leaves look about right as well as the petal veins. Our 1974 wildflower book describes it as a frequent garden escape :-(
My effort for Wildflower week - hosted by Miranda1008