Renault Sport F1, which supplies power units to Red Bull, Toro Rosso, Lotus and Caterham, has revealed that it's still awaiting payment from some of its customers. The manufacturer struggled during the pre-season and has heavily invested in turning its fortunes round which has somewhat paid off. President Jean-Michel Jalinier says their constant development requires funding. Some of that is coming from Renault itself, whilst some is coming from the teams it supplies. However he confirmed that "some of the teams" haven't paid or are paying later, which he described as "unacceptable". "In order to develop the action plan we need to secure resources and our resources...
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