Dyfed-Powys Police Chief Constable Mark Collins is to retire. Dyfed-Powys Police chief constable Mark Collins is to retire early next year after 35 years in policing and five as head of the force. Having started his policing career as a Special constable with Sussex Police in 1985, he returned to his home force in 1987 and continued to volunteer on the front line until joining the Metropolitan Police in 1991. Thirty years later, after rising through the ranks across a number of forces and leading specialist units to combat regional organised crime and international terrorism, Chief Constable Mark Collins QPM is preparing to leave a force which has restructured over recent years to meet the demands of modern day policing and very rural communities. Two challenges to be met with innovative thinking, a real understanding of local issues and an engaged workforce.