Both France and Britain approached various other nations to join on the collaborative programme, however negotiations with interested nations were often protracted, in part due to there having been a prevailing attitude of scepticism; author C.N. Hill stated that "many countries thought that the U.K. was seeking to foist an obsolescent launch vehicle on them, and making them pay the costs". The participation of many nations hinged upon gaining the endorsement of Germany, who was eventually won over and chose to participate. As a result of this diplomacy, it was decided to proceed with the formation of the European Launcher Development Organisation (ELDO) group.