Translate the following English sentence to French:
"If Mr Bigliardo would like to substantiate his claim in more detail, I should be pleased to receive his letter and answer it. But if he would like a straightforward answer now, then it has to be that the Commission cannot intervene."
Si M. Bigliardo souhaite prouver le bien-fondé de sa plainte plus en détail, je serai ravi de recevoir sa lettre et d'y répondre, mais s'il souhaite une réponse directe dès aujourd'hui, cette réponse est que la Commission ne peut intervenir.