Whenever it is necessary to proceed to the choice of a new Speaker in consequence of an intimation to Her Majesty by the Speaker of his wish to relinquish that office then the Speaker shall continue to take the chair and shall perform the duties and exercise the authority of Speaker until a new Speaker has been chosen, whereupon the Speaker shall leave the chair and shall cease to perform those duties and to exercise that authority and the Speaker Elect shall take the chair accordingly:Provided that, if when this House proceeds to choose a new Speaker the unavoidable absence of the Speaker has been announced, the Deputy Speaker shall forthwith leave the chair and the chair shall be taken in accordance with the provisions of paragraph (1) of this order.