62Furthermore, according to that case-law, ‘State aid’, as defined in the Treaty, is a legal concept which must be interpreted on the basis of objective factors. For that reason, the EU Courts must, in principle, having regard both to the specific features of the case before them and to the technical or complex nature of the Commission’s assessments, carry out a comprehensive review as to whether a measure falls within the scope of Article 107(1) TFEU (see judgment of 22 December 2008, British Aggregates v Commission, C‑487/06 P, EU:C:2008:757, paragraph 111).