riddlesdown high school means: Riddlesdown Colligate, or Riddlesdown High school as it is now known is an affluent middle-of-nowhere school. Riddlesdown Colligiate is located in Croydon and boasts a nice uniform, compared to Saint Filominas. It also has a large field. Although the food is good, it’s not great. However, if you do go to Riddlesdown Colligiate you will sound impressive as there have been many famous visitors such as Kate Moss. (in Community Dictionary, added by Giovani Walsh)