Mercedes F1 boss Toto Wolff regrets the war of words that unfolded last year between himself and his Red Bull counter-part Christian Horner and which undermined the professional relationship between the two men. There was no love lost last season between the two team chiefs following a series of off-track conflicts between Mercedes and Red Bull. The rivalry was at its worst ahead the Azerbaijan Grand Prix when Mercedes threatened to protest Red Bull's car which it believed was running a non-conforming flexible rear wing. Horner then took aim at Mercedes' front wing, saying that Wolff would be better inspired to "keep his mouth shut", a personal gibe to which the Austrian...
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