Ukip party leader Nigel Farage has failed to win a seat in Thanet South, losing to his Conservative rival.
It is now expected he will resign as party leader, having previously committed to doing so if he failed to win his seat.
Earlier, as arrived for the delayed count in Thanet South, Farage said other results had delivered "disappointment" for his party, but added that he believed it would trigger demands for electoral reform.
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The Ukip leader said: “There are four million people out there who have voted for Ukip, and I am struck that a party that gets half of the vote in one part of the UK gets 100% of the seats and another party that gets four million votes is going to have very little representation.
“I think, longer term, this is going to make people quite frustrated. I think the desire for change will be strong after this.”
Ukip emerged from the General Election with its share of the popular vote massively up, but no increase in its tally of MPs.
Douglas Carswell held on in Clacton but his fellow Tory defector Mark Reckless has been ousted in Rochester and Strood.