3SThe person appointed to hold the inquiry may, on the motion of any party thereto or of his own motion, serve a notice in writing on any person requiring him to attend at the time and place set forth in the notice to give evidence or to produce any books or documents in his custody or under his control which relate to any matter in question at the inquiry:
Provided that—
(a)no person shall be required in obedience to such a notice to attend at any place which is more than ten miles from the place where he resides unless the necessary expenses are paid or tendered to him; and
(b)nothing in this subsection shall empower the person appointed to hold the inquiry to require any person to produce any book or document or to answer any question which he would be entitled, on the ground of privilege or confidentiality, to refuse to produce or to answer if the inquiry were a proceeding in a court of law.