Christian Horner says much of the fun in this thrilling Formula 1 season comes from winding up his arch-rival Toto Wolff. Red Bull and Mercedes are fighting out an increasingly compelling World Championship battle, with only two points separating Lewis Hamilton and Max Verstappen in the Drivers' standings and 15 the difference in the Constructors'. Horner's Red Bull team are therefore back to playing catch-up in both title races, having held the advantage for much of the campaign which has seven races remaining. Besides the close battles on track, there has also been a tussle to gain the upper hand between the two team principals with Horner and Wolff trading barbs all season via media...
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