961d39fc_What_is_First_Past_The_Post__The_case_for
[The arguments against] Rather than allocating seats in line with actual support, FPTP rewards parties with 'lumpy' support, i.e. with just enough votes to win in each particular area. Thus, losing 4,000 votes in one area can be a good idea if it means you pick up 400 votes in another. With smaller parties, this works in favour of those with centralised support. [The case for] 
It encourages 'broad-church' centrist policies.
What is First Past The Post
The case for