55In addition, it should be recalled that the classification for legal purposes of an act or a measure, such as a letter, by the General Court is a question of law which may be raised in an appeal (see, to that effect judgment of 1 June 2006, P & O European Ferries (Vizcaya) and Diputación Foral de Vizcaya v Commission, C‑442/03 P and C‑471/03 P, EU:C:2006:356, paragraph 90, and the case-law cited). Hence, the question of whether a letter sent by an institution in response to a request to act brings an end, or not, to the failure to act alleged against that institution is a question of law which is capable of being examined on appeal.
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