People are people they move on. Employ the right people in first place that can do job. Stop making too many managers in too many departments.
Understand the reason why and see if their can be a development plan to see if they would stay so that they keep their best resources
Answered - Housing Manager (Current Employee) - Barking and Dagenham, Greater London
Give them leave time
Answered - Catering Assistant (Former Employee) - Barking and Dagenham, Greater London