Compare & Contrast…

It was sold/bought as a "Yellow Foxglove".  Looking it up, it appears as such - except - it seems a wee bit smaller than the photos look.
If it behaves the same as the resident ones it'll make seeds this year,  they'll grow next year and flower the one after that.  
That well know phase again:-
"We shall see."
I wonder if they'll X?  Both are Digitalis - BUT - I can't offer it any "warm bushy slopes and I've certainly done no logging of late; I hardly think this qualifies?

"Digitalis grandiflora
Digitalis grandiflora, the yellow foxglove, big-flowered foxglove, or large yellow foxglove, is a species of flowering plant in the genus Digitalis, family Plantaginaceae. It is native to southern Europe and Asia. In mountains it grows on warm, bushy slopes or areas left after logging"