1919
No 5 & 6 Brookside purchased as Sanatorium and East House.
Ross Robertson Shield gifted in memory of J. Ross Robertson.
Number of boys 225.
Rev. Harry Bisseker appointed Headmaster. Bisseker had been school Chaplain from 1901-1904 and subsequently Chaplain to the Leysian Mission, so he understood The Leys well and was an obvious choice to replace Barber. He was increasingly subject to ill-health and in 1929 the Governors gave him leave of absence for a year whilst Balgarnie acted as Headmaster. However, Bisseker’s health gave way again and he retired in 1934.