Former world champion Sebastian Vettel has said he would prefer more transparency in Formula One in connection with the affair around Red Bull team principal Christian Horner. Horner was cleared in an internal probe over alleged inappropriate behaviour towards a female team employee who has since been suspended. Messages allegedly between Horner and his accuser were later leaked to leading F1 figures and the media. Vettel, who won his four world titles 2010-2013 under Horner at Red Bull, told Sky TV on Wednesday that “it would be nice if there was simply more transparency so that you really co…