# Commission Delegated Regulation (EU) 2019/934 of 12 March 2019 supplementing Regulation (EU) No 1308/2013 of the European Parliament and of the Council as regards wine-growing areas where the alcoholic strength may be increased, authorised oenological practices and restrictions applicable to the production and conservation of grapevine products, the minimum percentage of alcohol for by-products and their disposal, and publication of OIV files, Division 4: As regards quality aromatic sparkling wines:

Extent: E+W+S+N.I.

(a)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. ...
(b)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;
(c)the addition of expedition liqueur shall be prohibited;
(d)the length of the production process for quality aromatic sparkling wines may not be less than one month.

---
Source: https://www.legislation.gov.uk/eur/2019/934/annex/II/division/B/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-934/annex-II/division-B/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.