 The ELDO not only served the purpose of harnessing Blue Streak, but also fulfilled ambitions to produce a European rival to the American and Soviet launchers being developed and deployed at that time.In response to the rise of the ELDO initiative, work on the competing Black Prince launcher gradually came to a halt as attention from the British government drifted towards European collaboration.Following the study of various designs and concepts, the ELDO arrived at a three-stage approach which was given the designation "Eldo A", this was later formally named as "Europa".