These events would give her the longest build time for any of the Flower class. She was built as a short fo'c'sle corvette, but after her salvage she was given a lengthened fo'c'sle and minesweeping gear. Although many Flowers eventually got the lengthened fo'c'sle, "Bryony"s was much longer than normal and she could be discerned by such. She was finally commissioned into the Royal Navy on 15 March 1941, under Lieutenant Commander Stewart of the Royal Naval Reserve. She left Belfast, crossing the Irish Sea to Tobermory in Scotland to undergo a two-week work and training exercise period, after which she sailed to Gladstone Dock, Liverpool, where she would be based until June 1943. Whilst in her trials period she was assigned to escort Convoy PQ 18, the next attempt to deliver supplies to Russia after the heavy losses sustained amongst Convoy PQ 17.