Christian Horner insists no decision about Red Bull Racing's immediate future plans have been made despite paddock rumours that it has served a notice of termination with Renault for its engine supply. With its relationship already fractious on the back of Renault's struggles to develop its underpowered and comparatively unreliable power unit, matters are being exacerbated by the prospect of the French firm purchasing the Lotus team for a fully-fledged manufacturer effort in 2016. As it stands, Red Bull's relationship with Renault is due to conclude at the end of the 2016 season and Horner says he has assurances that it is contractually obliged to remain its 'priority' team next season....
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