Ironically Freddie and someone else used to do a bit of gardening for people around that time, including a relative of mine in Mayfield....Three in Wellington Road and strongly suspected in the earlier disappearance of a guy in Mayfield.
Actually I know someone who grew up in the same park as Freddie and they said he was really odd back when they were teens. Fred had a habit of catching spiders and pulling their legs off one by one.