Lets see - Big Ben and the Houses of Parliament? Check. A good ol' pea-souper fog? Check. A cheery cock-er-nee geezer on a bicycle? Check. It must be bleedin' Landon tahn guv'nor!!
Back in the day, a few major cities got unique ad designs depicting landmarks that have been deserted due to screenings of 'The Exorcist'. This was the London-centric one from May 1974