British electoral system is unfair and unrepresentative

In last week’s election, the Conservatives increased their percentage of the popular vote from 36.1%, in 2010, to 36.9%, with a corresponding seat increase of 28.
The Labour Party also increased its percent of the popular vote, from 29% to 30.4%, yet lost 24 seats and Farage’s UKIP attained 12.9% of the vote, but ended up with just one seat. How representative is that? Surely, a truly representative parliamentary democracy should reflect, in as far as possible, the voting wishes of the electorate by returning the commensurate number of candidates.