[7] 45 tons of fuel were carried, giving a range of 3,000 nautical miles (3,500 mi; 5,600 km) at 8 knots (9.2 mph; 15 km/h).

[7] Brereton joined the South Wales division of the Royal Navy Reserve in September 1954 and was renamed HMS St David in May 1955.

[9][11] Her magnetic sweep gear was removed and Type 193 Sonar was fitted to detect mines which could then be destroyed by divers[5] while active rotors incorporating electric motors were fitted to aid slow speed manoeuvrability,[12] and the ship's engines replaced by two Napier Deltic diesel engines rated at 3,000 brake horsepower (2,200 kW).

[13] In 1969 Brereton joined the 9th Mine Countermeasures Squadron based in the Persian Gulf, returning to British waters in December 1971.

[9][11] She suffered an engine room fire in June 1978, with repairs lasting two months,[9] and was refitted at Gibraltar in 1979.