Greens were not relevant in this case. And I hope they put no effort in at all.
The worst possible thing in the various elections over the next four years would be for the sensible 'left alternative' parties - Greens, PC, SNP and LD - to fight over the same votes. It would be disastrous.
Let them work together to figure out where each of their resources are best focused.
(Yes, I realise PC and SNP aren't going to be directly fighting over the same votes, but you know what I mean.)
