power them. This led to the placing of an initial British order for 245 aircraft, the last of which was to be delivered before the end of 1942. During October 1940, this order was expanded to cover 500 aircraft, 300 of which being scheduled for delivery during 1943. While these orders were ultimately unmet due to the implementation of the extensive American-led Lend-Lease arrangement, the British government did finance the procurement of aircraft for Australian use within the Empire Air Training Scheme. Forty CA-1 Wirraways were constructed before the improved CA-3 variant entered production. Although there were detail changes to the design, the change in designation had more to do with the next batch of Wirraways being built to a different government contract than any real difference between the two sub-types. During February 1942, the Australian War Cabinet issued its approval for the production of 105 Wirraway interceptors as "reinsurance against [an] inability to obtain fighter aircraft from overseas". Around this time, the War Cabinet also decided to reject an order for 245 Wirraways that had been received from Britain. In July 1940, at which point the United Kingdom was the sole European nation fighting against German in the war, the Australian Government issued a statement advising that "from this date onward Australia can rely on England for no further supplies of any aircraft materials or equipment of any kind. The CA-5, CA-7, CA-8 and CA-9 models were all broadly similar to the CA-3; only the CA-16 variant featured substantial design changes; amongst other purposes, several wing modifications had been made to allow for the carriage of a heavier bomb load, along with the addition of dive brakes for dive-bombing. Sets of 'dive bomber' wings (as fitted to the CA-16) were built under the designation of CA-10A (the CA-10 model was a proposed dive-bomber variant that remained unbuilt), and retrofitted to CA-3s, −5s, −7s and −9s; 113 Wirraways were converted. Seventeen Wirraways were modified post-war and delivered to the Royal Australian Navy (RAN), the modifications were incorporated under the CAC designation CA-20. These 17 aircraft included a CA-1, a CA-5 and numbers of all subsequent variants; they were operated under their original RAAF serials. Production of the type continued even after the end of the Second World War. In July 1946, CA-16 A20-757, the last aircraft to be built of a total of 755 Wirraways, was delivered to the RAAF.