4.As regards quality aromatic sparkling wines:U.K.
except by way of derogation, these may be obtained only by making exclusive use, when constituting the cuvée, of grape must or partially fermented grape must derived from wine varieties contained in the list given in the Appendix to this Annex. However, quality aromatic sparkling wine may be produced in the traditional way by using, as constituents of the cuvée, wines obtained from grapes of the ‘Glera’ variety harvested in the regions of Veneto and Friuli-Venezia Giulia;
control of the fermentation process before and after the cuvée has been constituted, in order to render the cuvée sparkling, may be effected only by refrigeration or other physical processes;
the addition of expedition liqueur shall be prohibited;
the length of the production process for quality aromatic sparkling wines may not be less than one month.