Hi All, I've just gone out to take photos of the rosette of leaves featured in Photos 5, 6, and 7. They belong to Campanula persicifolia or Peach Leaved Campanula.
Basic rosette
More growing together. Rooted shallowly, easy to dig out.
Here flower stalks are growing, with Geum Cosmopolitan, behind.
These might be what they will look like. Send a picture to let us know. Hope this helps.