It’s actually quite reassuring that Labour are third and not second because as you say it indicates that the vote isn’t being split or at least not all that much. I suspect at least some of those Labour votes will have been concerns over splitting the vote and not wanting to do that, so going with the more traditional option. I suspect that subsequent elections (there’s one coming up in my constituency soon) will look at this result and see that it is in fact safe to vote green.