If you don't like school, the last thing you usually want is to end up back there, some 40 years later, as headteacher.
But that is exactly what former pupil Chris Fenwick, 56, has decided to do. The new head at Collingwood School in Sutton attended the prep school in the 1960s before leaving at the age of 10.
Although he did "not like school very much" he is pleased to be back. "Having been all around the world in the Navy and all around the country as a teacher, it's nice to be back at my old school," he says.
Maybe all pupils feel nostalgic about their old school eventually. Their teachers just hope they don't hang around long enough to put their young charges in detention one day, only to take orders from them decades on.