Given the fact that much communication transcends geographic boundaries, I think the only way to make it enforceable is if you agreed with the principle, and I think the principle is pretty difficult to refute. During election campaigns we all agree that we shouldn't advertise because it represents some kind of improper communication. A by-election is the same kind of thing: it is an election. It's an election for a small group of people, but it's an election. How do you impose that same principle on a smaller group? The only way to do it is to ban all government advertising outright during by-elections. I actually don't think the costs would be great, but I also take heed and listen to Professor Marland's point about the costs and the benefits of doing so.
On September 28th, 2017. See this statement in context.