Christian Horner has admitted he misses Formula One and feels he has unfinished business in the sport , speaking publicly for the first time since his departure from Red Bull . The 52-year-old was dismissed as Red Bull team principal following July's British Grand Prix, with his official exit agreed in September. During his two-decade stint with Red Bull, Horner presided over a remarkable era of success, securing eight drivers' and six constructors' championships. Red Bull's decision to part