9Where, under section one of the Public Record Office Act, 1877, a Schedule has been prepared of classes of documents which it is proposed to destroy on the expiration of a specified period as not being of sufficient public value to justify their preservation in the Public Record Office and the Schedule has, in accordance with the said section one, been submitted to both Houses of Parliament for not less than four weeks, any document of a class specified in the Schedule may, after consultation with the Inspecting Officers of the Public Record Office, be destroyed before the expiration of the period specified in the Schedule in relation to documents of that class.