For five and a half years during the Second World War, Wilson's was evacuated to a Camp School at Itchingfield near Horsham, Sussex, and for the only period in its history became a boarding school. The whole compound stood around a broad elliptical area, set in large part to grass and the remainder, an asphalt quadrangle. Radiating from this central area, in spoke-like fashion, was a series of large cedarwood huts. These were the dormitories, ablution blocks and classrooms. Two larger buildings stood adjacent to the asphalted space, one the dining hall and the other the assembly hall which also functioned as the gym, cinema and church. The whole establishment catered for four hundred plus boys forming six houses, all named after past headmasters of the school, Nairn, Macdowell, Wilson, Kelly, Whiteley and Jephson. The Head Master of Christ's Hospital was kind enough to allow Wilson's the use of the school's cricket pitches, swimming bath and other facilities, including the Great Hall for Speech Day.