16(1)Where the Board are not satisfied that the information given in a return delivered by any person under paragraph 9 above is correct and complete or a person who the Board believe to be chargeable with the tax has failed to deliver to the Board a return under that paragraph, the Board may by notice in writing require that person—
(a)to deliver to the Board, within such time as is specified in the notice (not being less than thirty days), copies of any such accounts, books, records or other documents whatsoever in his possession or power as may be specified or described in the notice ;
(b)to make available, within such time as aforesaid, for inspection by an officer authorised by the Board all such accounts, books, records or other documents whatsoever in that person's possession or power as may be so specified or described,
being, in either case, accounts, books, records or documents which the Board may reasonably require to inspect for the purpose of determining whether a person is chargeable to the tax or the amount of the tax with which a person is chargeable.
(2)An authorised officer of the Board may take copies of, or make extracts from, any accounts, books, records or other documents made available for inspection under this paragraph.
(3)Nothing in this paragraph shall require a person to deliver or make available for inspection any particulars of an account held by any person except the balance at any material time.