By Andy Silvester Where the City’s movers and shakers have their say. Today, it’s City A.M.’s editor Andy Silvester with the notebook pen.Over the weekend I found myself discussing work with a pal, who for all his talents in his own world, remains somewhat distant from the world of finance. Somehow or other we got onto the subject of the latest short seller attack, this time by Glasshouse, on Soho House. After doing my best Margot Robbie in The Big Short impression – using beer mats and a pint of Young’s Ordinary to explain short selling – my pal was distinctly nonplussed. In short, his argume…