This result puts to bed all the previous silly talk of unelectable people and ideas too radical to gain wide support. The Labour program in health, education, equality, the work place, etc was a clear, strong, left wing one and it was received well across the UK because people see that it would really benefit them in all those areas. Let's build on that...
"Meanwhile, the leftwing opposition leader, Jeremy Corbyn of the Labour party – who had been written off before the campaign as unelectable, extreme and incompetent – saw his personal ratings and those of his party rise, and stunned pundits by gaining 31 seats, giving Labour a total of 261 MPs.
Labour defied the odds to win around 40% of the vote, with the Tories on 42%. Corbyn’s aides said the jump in the party’s share since previous leader Ed Miliband won 30% in 2015 was the largest between two general elections for any party since 1945. It was also higher than the 35.2% won by Labour’s Tony Blair in his third election victory in 2005."
https://www.theguardian.com/politics/2017/jun/09/british-election-explained