If you're walking up Morrab Road, is it on the 'garden' wall of the building at the junction between North Parade and Morrab Road on the right? Think there's some bunny graffiti there too.
Richie, you know the one I took on the red post box? well went passed there today and the post box has been given a lick of paint!! looking very nice too, so glad my mystery heart got guessed correctly.!