Yep, it's the BBC
The actual ad campaign quite smartly avoided using people
All irrelevant, anyone willing to do this is already doing it, the people unwilling to do this will not be swayed by a poster.
Discussion
The point of this might be to help people handle it themselves
Someone might not listen to a sign, but still listen to someone confronting them, and the confronter might be given the confidence by having "point at sign" as a possible plan