Corbyn's a mild social democrat. That's fairly radical for 2017 when everyone thought left wing politics dead across the board as recently as April of this year. Corbyn's also one man but the expansion of Labour Party member groups, publications such as The New Socialist and even media outlets such as Novara Media, although I find them irritating personally, is emblematic IMO of a wider engagement with the issues that you've highlighted. It reminds me of 2014 except there is actually momentum and a feeling that the party co-opting the momentum isn't going to do nothing with it.