Of the second order, the 12 ships under construction in Britain were taken over by the RN and re-armed with British ordnance; all of these French corvettes were renamed and given 'Flower' names in keeping with the class.

The specific request for a Harland and Wolff ship had come after a study of vessels from various yards convinced him of the superiority of that company’s craft.

My Lords of the Admiralty, surprisingly, had granted his request when Rose commissioned HMS Alisma on 14 February 1941.

[9] They were soon in action with other groups between 19 July – 1 August 1941 with Convoy ON 69 defending 26 merchant ships from 8 U-boats and 2 Italian submarines.

[10] B7's first convoys, in the spring of 1942, were uneventful, and as the pace of the Battle of the Atlantic hotted up in the summer and autumn, the group's charges were escorted without loss.

After conversion to a 724 GRT merchant cargo ship, including replacement of her steam machinery with diesel, she entered service in 1949 as Laconia for Compañia Marítima Mensabe SA, and was registered in Panama.

[3] On 16 July 1954 she sank in position 40°09′N 13°12′E / 40.15°N 13.20°E / 40.15; 13.20, south west of Naples, as a result of water leakage (flooding) during a voyage from Marseille for Eleusis with a cargo of ammonium sulphate.