Thanks everyone for the comments and giving this attention, especially to Headexam for sharing it here before I was able too (I wasn't a member). Sadly the 'oss is still missing despite my searching and asking, the children have even turned into superheroes of late and been using their powers in the search! I have become quite obsessed with this and even taken holiday from work to try and track her down but at present seem to have hit a wall, I'm very disappointed with the Police for leaving her there where she was first dumped, besides anything else it was a school route and if any of the children had started her it could have ended in a very messy way.
Please keep vigilant, I can name several distinguishing marks besides the obvious.