I had a glass of Swiss's sparkling wine a couple of weeks ago and it was actually the worst I've ever tasted. And I've been drinking BA champagne for 20 years. I had to give it back and wash my mouth out with a glass of white wine - which I don't even like.
We can debate the intellectual role of positioning of champagne vs. a sparkling wine, but they should only use the current stuff for cleaning the toilets.