The Presiding Officer shall notify the Parliament of that date.
2. The date on which a constituency vacancy is to be treated as occurring is—
(a) in the case of a vacancy arising on the death of a member, the date of death;
(b) in the case of a vacancy arising on the resignation of a member, the date on which written notice of the resignation is given to the Presiding Officer;
(c) in the case of a vacancy arising under section 17(1) (effect of disqualification where a disqualified person is returned), the date on which the person concerned was returned as a member;
(d) in the case of a vacancy arising under section 17(2) (effect of disqualification where a member becomes disqualified), the date on which the member became disqualified;
(e) in the case of a vacancy arising under section 84(3) (failure of member to take the oath of allegiance), the expiry of the period of 2 months beginning with the day on which the member was returned or such longer period as the Parliament may have allowed; or
(f) in any other case, such date as the Presiding Officer may determine.
3.