You may already have your Halloween-themed ad in the (body) bag, but, before you unleash it on the world, there's no harm in a quick sense check.

CAP has issued some devilishly useful guidance to help you stay on the straight and narrow. And if you want to push the boundaries or just get an independent view, we're here to keep the light on for you.

This ad for The Generation of Z illustrates the kind of thing that might go a touch too far, particularly in a poster on the London Underground.