Candidates vying to become the new Strictly Come Dancing presenters face BBC “vetting” to avoid future scandals, in a move that will send “shivers” through the showbusiness world, insiders have said. Nine potential successors to Claudia Winkleman and Tess Daly are this week being put through their paces in a full-scale reconstruction of a live Strictly Come Dancing episode. Emma Willis, Rylan Clark, Zoe Ball and Tom Allen are among the names sai…