This paper reports on a feasibility study for an evaluation of a UK primary school‐based prevention programme that addresses multiple forms of abuse and neglect, identifying research design and ethical issues and exploring research practice. For this feasibility study, 194 children aged 6–11 years completed a baseline survey and 113 did so following the intervention. Eight focus groups were undertaken with 52 children and nine interviews with school staff. We highlight key considerations for conducting large‐scale mixed‐method research on sensitive topics with younger children, a focus that is largely absent from the extant research methods literature. The feasibility study showed that younger children can contribute their views on sensitive topics in ways that are measurable, replicable and reliable, contesting ideas that certain topics are too sensitive to explore with younger children.