Frenchman Laurent Mekies got down to work as Red Bull team principal on Thursday, a day after replacing Christian Horner, and recognised big challenges ahead for the once-dominant former champions.

Red Bull’s Formula 1 team is changing team directors for the first time since it was founded 20 years ago, after Christian Horner's sacking sent shockwaves through the sport on Wednesday.

Horner appeared to have lost the confidence from Red Bull's Thai and Austrian shareholders amid a slump in performance, a long-running power struggle between different management factions and questio...