By Daniel Moxon Both Christian Horner and the member of staff accusing him of ‘inappropriate behaviour’ continue to work for Red Bull Racing as the team principal prepares for intense questioning on the matter. Horner is the longest serving team principal on the Formula 1 grid having held the role since 2005. But the 50-year-old is fighting for his future with the team amid allegations made by a female colleague of the race team. The Red Bull Racing chief denies the claim made against him. The matter is being taken extremely seriously by the Red Bull parent company, which announced the investi…