The leader of Kent County Council (KCC) is leaving the post after eight years.
Sir Sandy was first elected as a county councillor in 1989
Sir Sandy Bruce-Lockhart announced on Monday that he will continue in the job until 12 October, when his replacement will be elected and installed.
He became leader of the county council's Conservative group in 1993 and then stepped up to his current role in May 1997.
He reflected that "local government is never easy", but said serving as leader had been a privilege and an honour.
Sir Sandy, 63, said he will continue to serve as a county councillor.
He will remain chairman of the Local Government Association, and is also a member of the South East England Regional Assembly.
"The county council is an outstanding organisation," he said on Monday.
"I have every confidence in this council for the future.
"It has been the very greatest privilege and honour to be able to serve this council and my county.
"Kent is a unique and wonderful county, full of special places and special people.
"I want to thank all members, officers and front-line staff who have, over eight years, transformed the council and its services from the bottom of the league tables of performance to the top."
KCC has gained the top rating in local government performance tables for the past two years running.
Sir Sandy came to Kent in the 1960s having spent his youth as a farm worker in South Africa.