McLaren supremo Zak Brown has given his thoughts on rival Christian Horner's sacking, having made no secret of the enmity between the pair in the past. Horner's 20-year run as Red Bull team principal came to an abrupt end earlier this month after a year of off-track turmoil and diminishing results.

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