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Or maybe a garden hybrid of the Campanula family.
I thought it might be Campanula but it looks very different to the other images of them. We didn't plant it in the flowerbed but found it there so don't really know how it got there.
There are a few, they are perennials so may have been there before you lived there or could have self-seeded from a plant in someone else's garden.
DID NOT LOOK AT LEAVES PROPERLY!!
Lat/Lng: 52.0729, -0.754686
OS grid ref: SP854423