Solution:

In UK & India First Past system is practising.

Proportional representation (PR) characterizes electoral systems by which divisions into an electorate are reflected proportionately into the elected body. If n% of the electorate support a particular political party, then roughly n% of seats will be won by that party.Proportional Representation is an electoral device in which seats are allotted to the political parties on the basis of the number of votes polled for them.

First Past the Post is a voting system, wherein people cast their votes to the candidate of their choice and the one getting the highest number of votes win.