Haileybury and Imperial Service College, (usually shortened to Haileybury & ISC or Haileybury), is a prestigious British independent school founded in 1862. The school is located at Hertford Heath, near Hertford, 20 miles (32 km) from central London, on 500 acres (2.0 km) of parkland occupied until 1858 by the East India College. Originally a boys' public school, it is now co-educational, enrolling pupils at 11+, 13+ and 16+ stages of education. Over 750 pupils attend Haileybury, of whom more than 500 board. The principal architect, William Wilkins, also designed the National Gallery in London, and Downing College, Cambridge. The school is built around four ranges which enclose an area known as Quad, the largest academic quadrangle in the UK and one of the largest in the world. The site re-opened as Haileybury in 1862. The Chapel dome was added by Arthur Blomfield and completed in 1877. Further Victorian additions were designed by John William Simpson. The Memorial Dining Hall was opened by the future King George VI & Queen Elizabeth, and serves as a monument to former pupils who gave their lives in Great War.