The Vice-Warden of the Stannaries for the Time being whose Name shall or may be inserted in any Commission of the Peace for the County of Cornwall shall be qualified to act in the Execution of the Office of Justice of the Peace for the said County, although he may not have such Qualification by Estate or Interest in Lands, Tenements, or Hereditaments as is now enjoined by Law in the Case of other like Justices; provided that he be not disqualified to act for any other Cause or upon any other Occasion than in respect of the Want of such Estate or Interest;