CC/St Paul's has a reputation for a large number (not all so not attacking anyone on here)of pushy parents who are only interested in exam results (not a rounded child) and most CC boys that we know seem very unhappy, like coiled springs with poor social skills. There is also a culture of putting boys down who are not as bright (eventhough they managed to get in) and all in all our friends have been quite surprised and feel the environment to be too harsh. I would never send my sons there, even if we were offered a huge scholarship - see G55, I'm not totally biased!
I did enquire a very long time ago about DS going a year early and they said to me "No, because it will affect the league tables". Well, frankly, that spoke volumes too me!