By sacking Christian Horner, Red Bull has made a big change to try to return to F1 winning ways. But there are other steps it must take, too

Horner was the longest-tenured team principal on the Formula 1 grid, having led Red Bull since it joined the sport in 2005.

Red Bull has lost several key figures across the past 18 months, most notably design legend Adrian Newey, Sporting Director Jonathan Wheatley, and Chief Designer Rob Marshall. The sacking of Horner means that a fourth pillar of long-term success is gone.