>> stephen skelton: well, it's completely revolutionized it. >> stahl: stephen skelton, a member of thehly-respected institute of masters of wine, is a viticulturist, an expert in the science, production, and business of wine grapes. i never heard of really good english wine, i have to be honest with you. >> skelton: no, it was-- it was very, very rare, until we realized that you could grow these classic french champagne varieties in-- in our climate. >> stahl: this is what they grow in champagne? >> skelton: yeah. and they now grow very, very successfully here in the u.k. >> stahl: what used to be a minute cottage industry run by retirees and gentleman farmers is today one of the fastest wine-growing regions in the world. this is quite an operation going on. >> skelton: oh, it's big. it's a big winery. >> stahl: in 2018, the vintage in england was so bountiful that some vineyards had to scramble to buy vats and tanks to hold it all. others simply threw grapes away. by the end of the decade, winemakers here will produce an estimated 20 million bottles a year. >> skelton: the foundation