After the win in Gorton & Denton, the Greens' narrative will (rightly) be that they are in the ascendance & people thinking of voting for them should not be concerned its a 'wasted vote'.
Labour will be trying to maintain by-elections are always anomalous & should be ignored or at least discounted, which in this case may be mistaken?
ReformUK Ltd are already telling a story of conspiracy & voter manipulation.... which is right out of the Trump playbook.