On 18 September they joined two Soviet destroyers in escorting the inward bound Convoy PQ 18, which had come under air attack. The convoy arrived on 20 September and "Britomart" resumed her sweeping duties. She was next deployed on 17 November with HMS "Halcyon", "Hazard", "Salamander" and "Sharpshooter" in escorting Convoy QP 15 through the Barents Sea. They were detached on 20 November and returned to Archangel. "Britomart" was briefly in the UK at the start of 1943, but was nominated to return to Russia as part of the escort for convoy JW-52, and joined the assembled convoy at Loch Ewe. She deployed on 17 January with the corvettes HMS "Lotus" and "Starwort", and three naval trawlers. The convoy came under air attack on 24 January, but these were ineffective. They arrived on 27 January and "Britomart" resumed her usual duties. On 24 July 1943 she helped get a fire under control after an attack by four Messerschmitt Bf 109s started a fire on the SS "Llandaff". The attack took place about NE of Kildin Island. "Llandaff" was part of a small convoy bringing timber from the White Sea to Kola Inlet. She escorted several more convoys through the Barents in February 1943 and continued her sweeping duties until October. She briefly came under air attack whilst sweeping off Cape Article, and was hit by two bombs. They bounced off the deck without exploding. She returned to the UK in November 1943, having escorted convoy RA 54A and after arriving on 14 November she underwent a refit. On completion of the refit she was nominated to join the newly formed 1st Minesweeping Flotilla, along with HMS "Harrier", "Gleaner", "Halcyon", "Hussar", "Jason", "Salamander", "Seagull" and "Speedwell". Throughout February and March 1944 they carried out their duties in the North Sea, and were subsequently nominated for minesweeping support during the planned allied landings in Normandy (Operation Neptune). They sailed for Portsmouth in April 1944 and joined Force S. They were instructed to clear the approach channels to the beach head anchorage areas, and had three Motor Launches and four Isles class danlayers attached to the flotilla for these duties. "Britomart" took part in preparatory exercises with the ships of Force S, and carried out night sweeping exercises with the Flotilla.