Image may be NSFW. Clik here to view.Joan BursteinPhotography by Ben McMahonAt Christmas, viewers of the fashion website SHOWstudio were given an unexpected treat in the form of a video message by Joan Burstein, the venerable owner of the legendary shopping institution, Browns in an affectionate homage of the Queen’s annual festive address. “I was very nervous actually, I really had to be talked into it to be honest,” confesses the lady better known as Mrs B. “I’m a great monarchist and a gre...