Six ships were completed as survey vessels, and the majority of the "Aberdare" group arrived too late to see service during the First World War. Thirty-five were cancelled after the armistice. Interwar, eight were sold out of service, one was sold to Siam, one was converted to an RNVR drillship and 52 were scrapped. The majority of the remainder spent the period from 1919 to 1939 in reserve around the world, with Malta and Singapore having most of them, so that on the outbreak of World War II there were still 27 available for service, to which a further two were added by requisition from mercantile service.