“Classic Method” wines are those that are made in the same way as champagne: the bubbles come from a second fermentation in the bottle. It’s a more expensive way to make wine sparkle than the “tank method” used to make prosecco and some of the newer, more experimental breeds of fizzy English wines.
It also brings different flavours: wines produced by the Classic Method are richer, more toasty and more complex than the more fruity, simple wines made using the Tank Method. Until now, it has been hard for customers to know which sort of wine they are buying when they buy an English or Welsh wine with fizz in it.