The new operation was initially successful. In Formula One, March cars won three of their first four races. One of these was a world championship race, the 1970 Spanish Grand Prix, won by reigning world champion Jackie Stewart in a customer car run by Tyrrell Racing. As a result, March finished third in the 1970 Constructors' Championship. The factory also sold 40 cars to customers in various lower formulae. Despite these successes, the organisation got into financial difficulty almost immediately. The Formula One operation was costing more than the customer car business was making. The March works team's contract with its lead driver, Chris Amon, was expensive, and Mosley, in his own words, "tried at every opportunity to get rid of him". He reasoned that Stewart's highly competitive customer car was enough to show March in a good light. Amon stayed to the end of the year, but Mosley succeeded in "restructuring" his contract, saving the company some much-needed money. At the end of the season, Mosley successfully demanded full control of the finances, including the factory run by Coaker, who left shortly afterwards. Mosley and Herd borrowed £20,000 from relatives and friends to support the company into its second year. According to Lovell, the money came from Mosley's half-brother, Jonathan Guinness.