At about the same time I was starting my first company, (Computerad, 1985 I think it was), I lived in Back Hill, London EC1. There were a couple of large advertising hoardings nearby, which mostly carried tobacco ads - and one of my neighbours obviously objected. He (they?) signed themselves 'Coughin' everytime they defaced an ad, and sometimes their additions were very witty.
I was impressed by the effort and wit exhibited in the graffiti and started to photo-document it. Clicking on the thumbnail will download a larger picture.
If any viewers of this page have any information about 'Coughin', or perhaps some of you have similar pictures you'd like to publish, or if you know of any other sites like this - please let me know.