2.13 The Deputy Prime Minister is appointed by warrant. If the Prime Minister is unavailable or unable to exercise the statutory or constitutional functions and powers of the office, the Deputy Prime Minister can, if necessary, exercise those powers and functions (see paragraph 6.57 on the role of the Deputy Prime Minister in the event of the sudden death or incapacity of the Prime Minister).
2.14 As Acting Prime Minister, the Deputy Prime Minister may exercise other prime ministerial functions and powers, in consultation (where appropriate and practicable) with the Prime Minister. The Prime Minister may specify their expectations of the Acting Prime Minister.