Hi, my friends daughters used to go to a very presigious private school. She's recently had to take them out. The school she applied to is the nearest state primary to this private school. She is not in the catchment, but her oldest daughter was offered a place streight away. Then they said to her "don't say anything, but we think there might be a place for your youngest daughter soon", and there was. About 2 weeks later she was in too.
This primary school is very sought after because of the area and they have a LOT of ex private school pupils. There's been loads of people I know that have applied and been turned down.
It could be totally legitimate, but it does make you wonder.