This wine keeps selling out (Picture: Robertson Buckhaven/Metro) Occasionally, for no apparent reason, something blows up in the world of drinks. Someone raves about a beverage on social media, the post takes off, and before you know it, the product has sold out. (Sorry, I just mansplained ‘going viral’ to you…) The current must-have in the world of wine is Trouble Cloudy Rosé from M&S. Online people have hailed it as ‘divine’ and ‘delicious’,…