In late nineteenth century and early twentieth century England and Wales, the slow but irresistible spread of universal elementary education up to the age of fourteen posed a serious challenge to many employers and working-class households. This indeed was a moment when the demand for and supply of child workers were strong in all the sectors of the economy. In fact, so imperious was the call of labour in some trades and places that, in order to cushion the blow, special dispensations were granted by the State from the outset, allowing parents to withdraw their children from school for good long before they had completed their education journey. Most early school-leavers then would enter the labour market as full-time workers. Moreover, throughout the period under study, it remained legal to employ schoolchildren, either out of school hours, regardless of their age, or during half of a school’s yearly sessions, under what was known as the “half-time system”, provided certain conditions were met. In this paper, I will focus on part-time child labour. I will examine its main characteristics, explore changes in its regulation and extent, and look into its effects on children’s health and education. I will argue that, contrary to what has sometimes been suggested in the historiography, to combine work and schooling was not in the children’s best interests. My findings indicate that it often entailed a lot of suffering, and could undermine working-class children’s chances to escape the child labour trap. Finally, as both the half-time system and out-of-school work were well-entrenched practices in some quarters by 1870, I will discuss whether the condition of schoolchildren engaged in part-time work tended to improve or deteriorate after that date.