The vineyard train ride goes through 265 acres of vines planted on the SAME CHALK that Romans recognized 2,000 years ago. This is the Newhaven Chalk formation — geologically IDENTICAL to Champagne's Senonian chalk that was split apart when the English Channel formed 10,000 years ago. The chalk drains water perfectly and reflects heat upward, the secret to great sparkling wine. Book the £25 guided tour at Denbies Wine Estate (denbiesvineyard.co.uk) for the train ride, winery tour, and tasting, and ask the guide: "Is this the same chalk as Champagne?" — it's the defining story of English sparkling.
🔄 BACKUP: Self-guided vineyard walks are free - just ask for a map at reception. You'll see the white chalk exposed in vineyard cuts.