Science centres are increasingly adopting co-development as a tool to engage diverse audiences with science. The case study featured in this practice insight draws on an evaluation of a programme that aimed to move U.K. science centres towards more inclusive practice. Interviews with staff from eight U.K. science centres and their community partner organisations reflected shifts in science centre practitioners' understanding and valuing of co-development approaches, and, especially, the centrality placed on relationships with communities. This case study can contribute to our understanding and help us reflect on how to align our practice with a commitment to equity.