I can't answer your question but would comment that any such description in the EU would be in trouble if they didn't supply genuine French sparkling wine produced in the Champagne region as it is a protected identity under EU law.

In EU law a bottle of bubbly desribed as Champagne must be sparkling wine produced in the Champagne area. Make no mistake however, the result of this protection to the Champagne name has produced some real "plonk", revolting stuff which just happens to be grown there and hence can carry the label!