Also a school in the South-East of England in High Wycombe (in Buckinghamshire, to be exact). It has approximately 1500 pupils at any given time. It expects a high standard from its pupils (this is reflected in the fact that few pupils get below a 'C' grade in exams, and a 'B' grade is considered the norm). On a typical year it is one of the top schools in the country (based on exam results), although in recent years it has begun falling down the charts.
I believe it was founded in the 15th century (although this is based entirely on hazy recollections) and it has in recent times (approx 1900) moved sites from the bottom of the High Wycombe valley to the top of the nearby Amersham Hill road.