Giles has enjoyed a successful career in policing across Kent, South Wales and Sussex. His work covered many aspects of operational policing including counter-terrorism, tackling serious organised crime as well as local policing. Nationally, he led several digital change programmes in policing and criminal justice. He was the national lead for Workforce, being the full range of people issues and leadership in policing. He championed diversity and inclusion on gender, race, disability and LGBT locally, nationally and internationally. Giles is a trustee for the UK Police Memorial Trust.