and insane persons are not qualified to become Members of the House of Commons. In order to vote, one must be a resident of the United Kingdom as well as a citizen of the United Kingdom, of a British overseas territory , of the Republic of Ireland , or of a member of the Commonwealth of Nations . British citizens living abroad are allowed to vote for 15 years after moving from the United Kingdom. No person may vote in more than one constituency. Once elected, Members of Parliament normally continue to serve until the next dissolution of Parliament. If a Member, however, dies or ceases to be qualified (see qualifications below), his or her seat falls vacant. It is also possible for the House of Commons to expel a Member, but this power is exercised only in cases of serious misconduct or criminal activity. In each case, a vacancy may be filled by a by-election in the appropriate constituency, with the same electoral system as in general elections. The term "Member of Parliament" is normally used only to refer to Members of the House of Commons, even though the House of Lords is also a part of Parliament. Members of the House of Commons may use the post-nominal letters "MP". The annual salary of each Member is currently 63,291. [5] Members may also receive additional salaries in right of other offices they hold (for instance, the Speakership). Most Members also claim between 100,000 and 150,000 for various office expenses