In the uk under our present electoral system a person standing for Parliament stand in a constituency in their own full name and can state the party nominating them and responsible for fulfilling the legal and financial obligations, under what is known as First past the post election, (FPTP )
First under FPTP, voting takes place in single-member constituencies. Voters put a cross in a box next to their chosen known candidate, and the named candidate who gathers the most votes in the constituency or other electoral is elected. The disadvantage of FPTP is it is a minority's choice - an MP can get elected with only 30% of that constituency in favour of him/her. In principle you are voting for an individual, not necessary a political Party. This means that 70% of the constituency did not want that candidate or party of their choice as their MP.. It actually means votes literally don't count, - up to 70% of the votes cast could be wasted because the constituent desired to support a political party, but their vote could not be accumulated in support of a party, rather than a named candidate. Whereas Proportional Representation (PR) is an electoral system in which parties gain seats in direct proportion to the number of votes they receive.
Currently in Britain we don’t have PR, and instead have a “first past the post” system: by which a party wins an election by achieving a simple mean where the winning candidate applies for the Whip of that Party. Simply in law you are voting for a named candidate to become your constituency MP not a political party even though that candidate has accepted nomination as that party’s named candidate. PR is the preferred system used by majority of democratic countries, but rejected in the past by The main two political parties because FPTP favours a two party system.
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As I understand it, a PR form of electoral system would be required to vote for party candidates.
If the political party’s want an MP to stand down if they resign from a political party, then it could only be achieved and enforced in law under a PR system where the MP is in office virtually an nomination from the party allocated that seat in Parliament. If we desire to get away from the 2 party bickering and extremists internal pressures, perhaps the time is right to adopt PR system most popular in the rest of the world.