"Colin Port is a hugely experienced chief constable who has led Avon and Somerset police with distinction over the last eight years, reducing crime and raising public confidence, steering the force through a period of major change and handling a number of high profile criminal cases.

"Over his career in policing he has built an outstanding record in leading difficult investigations at home and abroad, including in Yugoslavia, Rwanda and Northern Ireland. In recognition of that expertise he has led for the police service nationally on international policing. His skills and experience will be a big loss to the service."