Heron Glass may have ceased trading, but it is still a registered company. There are two Heron Internationals and they are both offshore companies plus several interconnected Heron International...s
Heron International is a trademark of Heron International Ltd, which is connected to the other Heron Internationals, and seems to be usable on virtually anything you fancy.
Heron Glass doesn't seem to be connected to any of these
Back to Poland I think