The data available is from a project that was a randomised controlled trial conducted with Ministry of Defence (MoD) Defence Intelligence (DI) staff, whereby employees were individually randomised to a treatment/intervention or control group. The intervention group received social support messages over the course of 8-weeks and the control group received no messages. Survey data at baseline and endline was collected from participants, and administrative data on employees (e.g. on turnover), again at baseline and endline was provided by a project partner at the MoD. Both the quantitative survey and administrative data used to ascertain the impact of the intervention on employees’ well-being is available here.