Christian Horner may not be in the Singapore Grand Prix, but his name is on the lips of many Formula 1 insiders. Martin Brundle has laid out the conditions of a potential comeback. While preliminary negotiations with Haas were unsuccessful, Horner has held talks with Lawrence Stroll, the Aston Martin owner. Martin Brundle says Christian Horner will ‘only come back’ if he gets a stake in a teamSpeaking to Sky Sports, Martin Brundle predicted that Horner would struggle to gain approval for his own team. Like the rest of the teams, Aston Martin are restricted by the cost cap, and they can only exclude the salaries of their top three staff members.