Sainsbury’s opens its first standalone Festive Fizz Bar in Central London 23rd December will be 'Sparkling Saturday', with Sainsbury's shoppers set to buy nearly half a million bottles in a single day. Retailer kicks off the fizz-tive season by opening first standalone 'Festive Fizz Bar' in London LONDON, UK, 2017-Dec-11 — /EPR Retail News/ — Sainsbury’s is forecasting that 23rd December 2017…