How to become an Ambassador ukBecoming an Ambassador to Great Britain
Becoming a Diplomate in the United Kingdom
While it is the case in many countries, up to and includes the United States, that ambassadors are nominated for many other purposes apart from promotions through rank and file on experience and years of service in the State Department, I believe that a number of ambassadors are also nominated from the State Department, or what we call a careers diplomatic.
Actually, what is your Q, to which the answers are yes, can be any politician of a state. Formerly, even to be a Diplomate, a certain degree of liaison with the sovereign or ruling authority of each nation is required, whether as a member of the royalty or in the militarized state as a high-ranking army official, who in most cases is driven out of the center of government.
Today, anyone can be a Diplomate by having a proper qualification in Welfare from renowned colleges, usually from their home countries or from the USA, Great Britain or France. For ten years I lived abroad, during which period I also got a fellowship for Master's programmes in Political and Economic Studies.
In general, the most straightforward course of studies to become a Diplomate is studying politics with a focus on external affairs. Although the Federal German Foreign Office accepts degrees in other fields of the sociological sciences, such as economics, Philosophy, Jurisprudence, Sociology or even Free Art, a diploma in External Affairs is the most straightforward course of studies.
Now there are many sketches of the many theory of global affairs, but I still think that these theory are very new and only point to external affairs, while the story of global affairs is the central point of the diplomatic world. If you have a different level of sociology, you can work in another part of the overseas service; as a law office, or even as a secretarial office, but politics and economy give you a good understanding of politics and can give you a job in the politics office, or what are now called local offices.