Did English cannon production depend on Scandinavian iron?

Did England's cast-iron cannon industry depend on easy access to Scandinavian iron?

Not primarily; Britain had good domestic iron, while large-scale Scandinavian exploitation became more important later.

English cannon production did not depend primarily on easy access to Scandinavian iron. Scandinavian ore existed, though the mass exploitation usually imagined belongs to a later period. Britain also possessed substantial good-quality iron of its own. Later Scandinavian supply patterns should not be projected backward onto early modern cannon production.