Diary: Are ad folk that dodgy?

Diary is at a loss to explain the hoax ad posters that have appeared on London Underground lately warning that advertising causes narcissism, depression and drug and alcohol abuse.

Tell us something we don't know, you might say. However, a tad controversially, the "ad" purports to be from Transport for London. Diary suspects TfL staff will be keeping a special eye out in future for a shifty-looking commuter armed with a paste bucket and brush.