While FPTP is responsible for its own share of distortions, in this case it's the use of Single Member Electorates that was the primary cause of UKIPs poor seat-for-vote return.
For example, something very similar happened in the last Australian Federal election, which doesn't use FPTP (it uses full preferential voting) but does also use Single Member Electorates: The Greens got 1,385,650 first preference votes, also making them the third-biggest party, for the return of 1 seat (out of 150).
For example, something very similar happened in the last Australian Federal election, which doesn't use FPTP (it uses full preferential voting) but does also use Single Member Electorates: The Greens got 1,385,650 first preference votes, also making them the third-biggest party, for the return of 1 seat (out of 150).