are, in theory, only 18 spots on the F1 grid in 2015. After missing the U.S. and Brazil grands prix, Caterham has used crowdfunding to help finance a return in Abu Dhabi. Japan's Kamui Kobayashi retained his drive while the team has also handed Briton and former tester Will Stevens his F1 debut. Both Caterham and Marussia remain on the official entry list for the 2015 season but their future is dependent on a hard winter drumming up funding to stay in the sport. With teams spending a minimum of $70m per season, employing a driver who offers pace, performance and a pot of personal talent is more important than ever for those teams for ca n't afford super-talents like Alonso.