High Quality Content by WIKIPEDIA articles! The City of London School (CLS) is a boys` independent day school on the banks of the River Thames in the City of London, England. It is the brother school of the City of London School for Girls (a girls` school within the City) and the co-educational City of London Freemen`s School (a day and boarding school in Surrey). It is also a member of the Headmasters` and Headmistresses` Conference (HMC).