Paul Nuttall has resigned as UKIP leader after the party failed to win any seats whatsoever in yesterday's general election.Nuttall came third in the Boston & Skegness race, and the party's overall vote share dropped by a huge 10.8 percent.Still, that hasn't dented Nuttall's optimism; with Theresa May's Brexit plan in tatters, he believes the next year-and-a-half could see a return to the UKIP glory days of 2015."I even predict, after last night, that if things go the way I expect, then UKIP could – in 18 months' time – be bigger in terms of poll ratings and members than it ever has been before," he said this morning, insisting that the party is "still on the pitch" and "more relevant than ever".He added: "It is clear that UKIP requires a new focus, new ideas and a new energy – and it is there amongst out ranks."