Looking at Opinion Polls, Votes, Seat returns and Proportionality of UK Elections.
In the run up to the May 2015, General Election.
The Line Chart shows how most of the parties have not changed much.
The crux of this is to look at how proportional is the representaion in a parliament from the votes cast for a particular party
The graph shows what percentage over or below of seats a party gets relative to its vote share..