Under section 107 of the Police and Criminal Evidence Act 1984 (England and Wales only), sergeants and chief inspectors may be designated (by an officer of at least the rank of superintendent) to exercise the powers of an inspector or a superintendent respectively. Such a designation will generally accompany such an officer being given an acting rank, so for most operational purposes there is no difference between substantive, temporary and acting ranks at Inspector and above (although there may be differences as to pay, pensions and insignia). However, under section 36 of that act, only substantive sergeants may be appointed custody officers.