[Under The Hill]

What is this - friend asking me and I don't know

[Aunt Sally]

It looks like red campion. Could be a double flower.

[mumofstig]

I knew I recognised the leaves, didn't know you could get double flowered ones - very pretty
https://www.alamy.com/stock-photo-double-flowered-form-of-the-red-campion-silene-dioica-flore-pleno-83571833.html

[mumofstig]

Could be a double Canterbury Bells plant, I seem to remember those have the same kind of leaves