For those of you that don't know, a ghostsign is a faded ad from the past, usually painted, and struggling to survive on modern day walls and shopfronts. Sometimes they are discovered when shops are being renovated and modern signs removed, or sometimes when a building next door is demolished.
Others just cling on, high up on walls, where they once had pride of place, and encouraged us all to use brylcreme, drink Bovril, eat Hovis, eat Chocolate, or enjoy Dubonnet. There were also lots to encourage smoking, and matches were popular ads too.
Have a look at the site, it is really fascinating, and will get you - looking up!