Campaign has collected the cream of billboards & posters (and two of them are for the creme of Manchester) at the outdoor hall of fame, and wants you to help vote for the very best and your personal favorites. My tip is, start in the 60s, choose your favorites, and ignore the fact that "Reg on Smoking" shows up in the 80's category even if it was from 1992. Cast your votes, I have.
Yes, of course the lightbulb economist poster is in there, as well as the "to our reader in high offices" bus. We've seen the 'roof of a bus used as poster' idea again later, with the hilarious brainsync of two campaigns using the same line: don't jump (and don't jump revisited).