Local elections in May. As we can see from the Gordon & Denton by-election, tactical voting is alive and well.
As I recall, each main party offers up three candidates to be councillors. This doesn't help with floating voters who want to hedge their bets. For instance, in my area in Surrey, Labour don't stand a chance really. Reform might. The Tories might. The Lib Dems - who came nowhere in Gordon and Denton - are on the upswing here but I don't like them that much, I might give Green a bit of a protest vote. That's all very well, but it could let in either the Tories or Reform, who I hate, so splitting the vote and getting the opposite or what I want.
Now - might it not be an issue for the Greens, say, while offering their three candidates, to promote one of them as the 'and if you only vote for one Green, vote for this one!'?
This way, I could vote for two Lib Dems and do a third vote for a Green. Any floating voters could put a cross against one Green candidate and if it's the same candidate, that vote will count - otherwise, well, those stray votes might well get spread out/diluted across those three Green candidates so it's not enough for any of them to get across the line. It avoids wasted votes.
Admittedly, the same could apply to Labour, who don't stand much of a chance here, or Reform. It's really a way of tactical voting that assists democracy imo.