Giant Bellflower (Campanula latifolia)

Giant Bellflower  (Campanula latifolia)

Observation - Giant Bellflower (Campanula latifolia) - UK and Ireland. Description: It has some hairs mainly on edges of leaves, but not very downy and flowers not in dense terminal head. Possibly a cultivar/garden escape? Any ideas?

It has some hairs mainly on edges of leaves, but not very downy and flowers not "in dense terminal head". Possibly a cultivar/garden escape? Any ideas?