If Becky Kean ever wants to organise a drunken party at her brewery, she’ll have to buy in beers from somewhere else.  This is because Becky’s company, London-based Nirvana Brewery, only makes alcohol-free beer.  Currently it brews seven different flavoursome types, from pale ales to a stout, and one with added green tea. And none of them will get you even remotely tipsy.