Help with identification

Alisontwomey1

Hi, can anyone help in identifying this plant please?
Purchased from garden centre with no label & everyone I asked didn’t know either!
Have also used a plant identification app with no luck!
I am certain it’s a type of campanula but which one?

Pete.8

Before reading your text, I thought the leaves look very similar to campanula pyrimidalis I'm growing this year.
The closest match I could find is Campanula punctata 'Blue Octopus' - but not sure.

Silver surfer

Looks like Phyteuma sp.

https://www.google.com/search?q=Phyteuma&client=firefox-b-d&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjzxab-6JDiAhUuQhUIHYWvBfgQ_AUIDigB&biw=1920&bih=944

Alisontwomey1

Yes!  This is it!! 
Description says ‘close relative of bellflower’ I was close! 
Its a new one to me & quite unusual looking, now I know what it is I can hopefully keep it alive!!
Thank you for your help