I. Introduction After more than 50 years since the entry into force of the Treaty of Rome, several aspects of State aid law still seem (rather increasingly so), and probably objectively are, subject to huge uncertainties. For instance, it has been acutely observed that the more one is involved with, and goes deeper into, the notion of State aid, “the more one realises how elusive it is”1. When compared with the notion of aid and other aspects of State