By Amber Murray Four of the UK’s biggest wine sellers have said that upcoming changes to alcohol duty will lead to price rises in a “bleak” warning to their customers. Majestic, Laithwaites, The Wine Society and Cambridge Wine Merchants are amongst the wine businesses who together launched a poster campaign against changes to the excise duty. Excise Duty on all wines between 11.5 per cent abv and 14.5 per cent abv (alcohol by volume) is set to rise. The change was introduced as part of Rishi Sunak’s new duty system last year but was postponed until next February. The single amount of duty paid…