All about fizz

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Across
  1. 1. Unit of measure for pressure inside a bottle of Champagne or sparkling wine (3)
  2. 2. Cava de... Cava's top classification (6,10)
  3. 5. Famous Californian sparkling producer, bought in 1965 by Jack and Jamie Davies (11)
  4. 8. Quartet (California sparkling) is associated with this Champagne producer (5,8)
  5. 9. The Proseccos from this single vineyard are revered above all others (8)
  6. 11. Famous New Zealand sparkling wine made by Cloudy Bay (7)
  7. 12. The late, great Michael Broadbent used to enjoy a glass of this Italian sparkling wine mid-morning (7,1,4)
  8. 14. South Africa's best bubblies are labelled as this (7,3,9)
  9. 17. Among the best denominations for Lambrusco (7)
  10. 18. Franciacorta comes from this northern Italian region (7)
  11. 19. This country leads South America in sparkling wine production (6)
  12. 21. Massive Cava producer (9)
Down
  1. 1. Languedoc sparkler made predominantly from the Mauzac grape (10,2,6)
  2. 3. Small sparkling wine appellation in the Rhône Valley (9,2,3)
  3. 4. The most important of the three dominant grapes used in Cava production (7)
  4. 6. Prosecco is made from this grape (5)
  5. 7. Famous producer of Tasmanian sparkling wine (5)
  6. 10. Trento sparkling wine producer that shares its name with a famous sports car (7)
  7. 13. Also referred to as the tank method of sparkling wine production (7)
  8. 15. This French sparkling wine category is made using the Champagne method (7)
  9. 16. Term used to describe the sparkling wines of Portugal (9)
  10. 20. Austria and Germany's sparkling wine (4)