Deeming provision expanded to include magistrates as equivalent to Court of Session, altering jurisdictional classification. The amendment substitutes the phrase 'deemed to be a Court of Session' with wording that reads 'deemed to be a Court of Session or the court of Metropolitan Magistrate or a Judicial Magistrate of the First Class, as the case may be,' thereby treating those magistrates as equivalent to a Court of Session for the purposes of the principal Act.