) News story Start date for major overhaul of Plymouth flood defence barrier The Environment Agency's major £3m repair and maintenance project of Plymouth's lock gates is due to start in September. From:Environment AgencyPublished2 August 2023 Sutton Harbour. Credit: Sutton Harbour Company Work is set to start in September 2023 on a major £3m repair and maintenance project for Plymouth's lock gates. They form a key part of the city's coastal defences, protecting hundreds of homes and businesses