 The Lark engine fared better, and although little used, was maintained in working order until 1945.Further consideration was given to upgrading the engines in 1939, but the start of the Second World War delayed implementation.Approval was eventually obtained to install a Crossley engine driving a Gwynne rotary pump, capable of pumping 150 tons per minute in 1941, but it was January 1945 before work was completed.