Not only did Labour fall below 20% (as the early returns I referenced last night suggested), it barely cleared 15%. It was the UK Independence Party that came in second.
The Conservatives won the plurality, but not much for them to crow about: 27.7% of the vote and 25 seats–which is 36.2%, for a really high “PR” advantage ratio of 1.31.
The biggest gainer in votes within the UK was the Green party (+2.4%).
Table of results by party at BBC (excluding Northern Ireland).