was built in Princes Avenue by John Laing and Co. at a cost of cost £43,638. After the Butler Education Act of 1944 When the United Kingdom Government passed the Butler Education Act in 1944 a Tripartite System was established dividing secondary schools into three categories, grammar schools, technical schools and secondary modern schools. The grammar school was deemed the place of education for the academically gifted (as determined by the 11-plus) and Kingsbury County School was selected to become the grammar school at which point the school changed its name to Kingsbury County Grammar School. The headmaster, Dr Payling (who had succeeded Mr Tracy after his retirement in 1949), saw the beginning of extensions in 1954. At this point in time, Kingsbury was also being served by a second mixed secondary school, which was chosen to become the area's secondary modern school after the 1944 Act was passed. The increase in the population of Kingsbury had continued unabated and building had started on a second mixed secondary school at a site in Bacon Lane in 1939 but this was not finished, mainly to do with constraints placed in the continuation of the building by the Second World War. In the meantime, Kingsbury Secondary Modern School began operating from the converted ex-Airco building, which had been vacated by Kingsbury County School in 1931. In 1952, what were to be Tyler's Croft county secondary schools, were opened as separate boys' and girls' secondary modern schools, and the pupils from the mixed Kingsbury Secondary Modern School were transferred to the new schools on Bacon Lane. Adoption of the comprehensive system In 1967 with the local authority Brent Borough Council having adopted the comprehensive system of education, Kingsbury County Grammar and the two Tyler's Croft schools were amalgamated to form the giant Kingsbury High School. Mr Jones, who had succeeded Dr Payling back in 1954, faced the task of managing the school's transition from being a grammar school to a comprehensive school. The Bacon Lane site was designated by the head as the Lower School under the management of a Head of Lower School, with the buildings of the former Kingsbury County Grammar to be used for the upper years. Three years after this huge reorganisation Mr Jones retired and the governors appointed Mr C. Mitchell in 1970. Mr Mitchell served 18 years as Headmaster and was responsible for a series of important