Wine Glossary

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A

Autolysis: The breakdown of dead yeast cells (lees) during extended ageing in the bottle. Autolysis releases compounds that produce the characteristic toasty, biscuity, brioche, and bread-dough flavours associated with aged traditional-method sparkling wine. The process is slow: meaningful autolytic character requires a minimum of 18 months and develops most fully over three to five or more years. It is arguably the defining process of premium sparkling wine.
Assemblage: The blending of different base wines, varieties, vineyard sites, and reserve wines into the final cuvée for a traditional-method sparkling wine. The assemblage is typically conducted by the winemaker in early spring following harvest, and it is considered one of the highest winemaking arts in the sparkling wine tradition. The complexity and consistency of a producer's assemblage is a key indicator of their technical ability.

B

Blanc de Blancs: A sparkling wine made exclusively from white grape varieties, almost always Chardonnay in the English context. Tends toward greater freshness, precision, and mineral character than blended wines. England's chalk-grown Blanc de Blancs is frequently compared to the Grand Cru Blanc de Blancs of the Côte des Blancs in Champagne.
Brut: The most common sweetness designation for traditional-method sparkling wine, indicating a dosage of 6 to 12 grams of sugar per litre. Despite containing some sugar, a well-made Brut tastes dry to most palates, as the acidity and autolytic complexity balance the sweetness. The term derives from the French for 'raw' or 'unsweetened' in its original historical usage.
Base Wine: The still wine produced from the harvest that will become sparkling wine after the tirage and second fermentation. English base wines are typically high in natural acidity and relatively low in alcohol, around 9 to 11 percent ABV, providing the structural raw material for traditional-method sparkling production. The quality of the base wine is the foundation of everything that follows.
Bead: The individual bubbles in a sparkling wine, particularly as they rise continuously from nucleation points in the glass. A fine, persistent bead with bubbles rising in a steady stream to the surface is the hallmark of a well-made traditional-method sparkling wine. The bead is directly related to the wine's carbon dioxide content and the texture of the glass surface.
Blanc de Noirs: A white or pale sparkling wine made from black-skinned grape varieties, most commonly Pinot Noir and Pinot Meunier. Careful pressing extracts the pale juice without colour from the skins, producing a wine with the structural richness of red grape varieties expressed in a white wine context. English Blanc de Noirs often shows red berry fruit character, body, and a vinous depth distinct from Blanc de Blancs.

C

Cuvée: In traditional-method sparkling wine production, the cuvée is the first and finest pressing of the grapes. More broadly, the term is used for any blend or individual wine that a producer wishes to distinguish, as in 'Classic Cuvée' or a named prestige wine. The word simply means 'vat contents' in French, though it has accumulated significant marketing connotations.
Chalk: The Cretaceous-era limestone formation that underlies much of southern England's finest vineyard land, and which provides the same geological base as Champagne's Grand Cru vineyards. English chalk drains freely, retains moisture at depth, warms quickly in spring, and reflects heat into the vine canopy. Its alkaline composition forces vines to struggle for nutrients, producing smaller berries with concentrated flavour and high natural acidity.
Clone: A genetically identical selection propagated from a single parent vine, chosen for specific characteristics such as small berry size, regular yields, aromatic character, or disease resistance. Different clones of the same variety, such as Chardonnay clones 95, 96, or 548, produce wines with subtly different characters. Selecting appropriate clones for English conditions is an ongoing viticultural research priority.
Canopy Management: The collective practices of managing the vine's leaf canopy, including shoot positioning, leaf removal, and hedging. In England's cool, cloudy climate, canopy management is particularly critical: excessive leaf cover reduces sunlight reaching the fruit and increases disease pressure, while careful leaf removal and shoot positioning improve air circulation, light interception, and ultimately fruit quality and ripeness.
Chaptalisation: The addition of sugar to grape must before or during fermentation to increase the potential alcohol of the resulting wine. Named for Napoleon's agriculture minister Jean-Antoine Chaptal, who promoted the practice. In England's marginal climate, chaptalisation has historically been common in base wine production for sparkling wine, though improved viticultural practices and warmer recent vintages have reduced its necessity in good years.

D

Dosage: The small addition of wine mixed with sugar (the liqueur d'expédition) added to a sparkling wine after disgorgement to adjust its final sweetness. Expressed in grams per litre (g/L). A Brut wine typically contains 6–12 g/L; Extra Brut is 0–6 g/L; Zero Dosage or Brut Nature is 0–3 g/L with no added sugar.
Disgorgement: The removal of the yeast plug from the neck of a traditionally made sparkling wine after riddling. The bottle neck is briefly frozen, the crown cap or cork is removed, and the frozen plug of sediment shoots out under the internal pressure. The bottle is then topped up with the dosage before final corking. The disgorgement date, sometimes printed on back labels, indicates how long the wine has aged on its lees.

F

Frost Protection: The range of measures taken to protect budding vines from spring frost damage. In England, late spring frosts, particularly in April and May, are a significant viticultural risk. Protection methods include wind machines, which circulate warmer air from above the frost layer; water sprinkler systems, which coat buds in ice that protects them from the more damaging effects of frost; and heaters or candles placed between vine rows.

G

Greensand: A type of sandstone rich in the mineral glauconite, forming a geological seam that runs through Kent and Surrey parallel to, and south of, the North Downs chalk. Greensand soils drain freely but are less alkaline than chalk, producing wines with fruitier, rounder character and a slightly different mineral signature. Balfour Hush Heath and many Kent estates on the Weald grow vines on greensand.

H

Harvest: The annual grape picking, typically running from mid-September through October in England. The harvest date is one of the winemaker's most consequential decisions, balancing sugar accumulation against acidity preservation and the risk of autumn rain and rot. English harvests have trended earlier by approximately two weeks since the 1980s as a consequence of warming conditions.

L

Lees Ageing: The practice of ageing wine in contact with dead yeast cells (lees) after fermentation. In traditional-method sparkling wine, extended lees contact develops toasty, biscuity, brioche-like flavours through a process called autolysis. English PDO regulations require a minimum of nine months on lees; premium producers typically age for two to five or more years.

M

Malolactic Fermentation: A secondary bacterial fermentation in which sharp malic acid is converted to softer lactic acid. In English wine, MLF is often used to soften the high natural acidity of the base wine, particularly in cooler vintages. Some winemakers block MLF deliberately to preserve freshness and tension. The choice profoundly affects the wine's texture and mouthfeel.
Mousse: The collective term for the bubbles and foam in a sparkling wine. A wine with a good mousse produces fine, persistent bubbles that form a consistent froth on the surface when poured. Large, coarse, or rapidly dissipating bubbles indicate a wine of lower quality or inadequate lees ageing. Traditional-method wines consistently produce finer mousse than tank-fermented wines.
Must: The freshly pressed grape juice, including skins, seeds, and pulp, before fermentation begins. For traditional-method sparkling wine production, the must is typically pressed very gently using a whole-cluster or pneumatic press to extract the pale, clean juice required. Must weight, measured in Oechsle or Brix, indicates the potential alcohol of the resulting wine.

P

PDO: Protected Designation of Origin, the highest classification for English wine, equivalent to Appellation d'Origine Contrôlée in France or Denominazione di Origine Controllata in Italy. PDO English Wine must be made from grapes grown, fermented, and bottled in England, using permitted varieties and meeting defined quality standards. PDO Sussex, PDO Kent, and PDO England are the principal designations in use.
Perpetual Reserve: A method of maintaining reserve wine in a continuously replenished solera-style system, where wine from each new vintage is added to older wine rather than keeping separate vintage reserve tanks. The resulting blend contains a theoretically infinite number of vintages, with the oldest wine present in ever-diminishing proportions. Langham's Perpetual MV and some Champagne house vins de réserve use this approach.
Pétillant Naturel: Often shortened to Pét-Nat, this is a naturally sparkling wine made by bottling still-fermenting wine before fermentation is complete, allowing the remaining fermentation to occur in the bottle. Unlike the traditional method, no tirage is added, no riddling is performed, and the wine is often released cloudy with residual yeast. Tillingham is England's most notable Pét-Nat producer.

R

Riddling: The gradual process, also called remuage in French, of rotating bottles incrementally over days or weeks to consolidate the yeast sediment created by the second fermentation into the bottle's neck, ready for disgorgement. Traditionally done by hand on pupitres (wooden A-frame racks); most modern producers use computerised gyropalettes that complete the process in days rather than weeks.
Reserve Wine: Wine from previous harvests that is set aside and blended into multi-vintage non-vintage sparkling wines to maintain house style and add complexity. Reserve wines are central to the non-vintage tradition in Champagne and English sparkling wine. Some producers age reserve wines in perpetual blends (see: Perpetual Reserve) for extended complexity.
Rootstock: The root system onto which commercial Vitis vinifera grapevine varieties are grafted, providing resistance to the phylloxera louse that devastated European viticulture in the nineteenth century. Different rootstocks influence vine vigour, yield, ripening time, and drought tolerance. Selection of appropriate rootstocks for English soils and climates is a significant factor in vineyard establishment decisions.

T

Traditional Method: The process by which Champagne and most premium English sparkling wine is made. After the base wine is bottled with a mixture of wine, sugar, and yeast (the tirage), a second fermentation occurs in the bottle, trapping the carbon dioxide that creates the bubbles. The wine is then aged on its lees before disgorgement.
Tirage: The mixture of wine, sugar, and yeast (and sometimes fining agents) added to the base wine when it is bottled for the second fermentation. The sugar in the tirage is consumed by the yeast, producing the carbon dioxide that creates the bubbles and the spent yeast cells that will later be removed during disgorgement. Precise calculation of the tirage sugar controls the final pressure in the bottle.
Terroir: The complete natural environment in which a wine is produced, including soil type, subsoil, geology, topography, climate, and microclimate. In English wine, terroir discussions focus particularly on chalk and greensand geology, south-facing aspect, proximity to the sea, and the relationship between England's cool maritime climate and the precision character it produces in Champagne varieties.

V

Véraison: The onset of grape ripening, typically occurring in August in England. During véraison, white grapes soften and begin to accumulate sugar while losing acidity; red and dark grapes develop their colour through the synthesis of anthocyanins. The timing and uniformity of véraison across a vineyard is a key indicator of the coming vintage's potential.

W

WineGB: Wine GB is the trade association that promotes and represents English and Welsh wine producers. It publishes annual industry reports, organises the WineGB Awards, runs English Wine Week each June, and advocates for the industry with government and regulatory bodies. Its annual statistics reports are the definitive source of production data for the English and Welsh wine industry.

Z

Zero Dosage: Also called Brut Nature, Non Dosé, or Sans Dosage: a sparkling wine to which no sugar has been added at disgorgement. The resulting wine is completely dry, often austere and mineral, demanding chalk or greensand soils with sufficient natural ripeness to avoid excessive tartness. Dermot Sugrue's Zodo is a notable English example.

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