I think the important point that Professor Marland just raised is the shorthand cue. What we want to avoid, or what we want to limit, is the idea of citizens making shorthand judgments about policies based on something that's extraneous to those policies.
In the end, the role of parliamentarians is to do two things. It is to create legislation and also to try to encourage good judgment. I think on this one we have to encourage good judgment because there's only so far legislation can go.