The principle of diplomatic immunity is one of the oldest elements of foreign relations. Ancient Greek and Roman governments, for example, accorded special status to envoys, and the basic concept has evolved and endured until the present. As a matter of international law, diplomatic immunity was primarily based on custom and international.
A diplomatic envoy however is not exempt from charges levied for specific services rendered. An example of this is the charge on cars entering central London. There are reports that diplomatic immunity has been used to avoid payment of traffic fines reaching to several million pounds. There are embassies who agreed to settle their accounts.