I read this thing in the Independent. You claim that the Green Party and yourselves share "values" such as the NHS, inequality, fairness.
The NHS is not values! Saying inequality is immoral is not really a shared value anyway.
Long term Labour policy, however, is "intensely relaxed about people being filthy rich." Being against climate change I'll grant you but there's only one Labour politician I think would make a good job of turning London Green, that's Christian Wolmar. But they're thinking of going back on the open primary idea by charging people to vote. Good luck mate!