In this report, we explore the effectiveness of independent custody visitors at monitoring race and gender equality in police custody. We found some examples of positive work by independent custody visitors to improve the treatment and welfare of Black, Asian and minority ethnic people and women in police custody. However, a number of custody visitors lack understanding of institutional racism and discrimination, and custody visiting schemes need to be more racially diverse to better reflect the people detained in police custody. We also found a range of systemic barriers preventing custody visitors from monitoring race and gender equality effectively.