The Buzzard was indeed a fine aeroplane, and large numbers were ordered before the war ended, though it lost out in the postwar RAF to the Sopwith Snipe (another very fine aircraft, see pic)
The Buzzard was developed by the Aircraft Disposal Company and a number were sold to Spain, Finland and Latvia (as the Armstrong Siddeley Jaguar engined ADC1, which was allegedly a match for the similarly-powered Armstrong Whitworth Siskin of the RAF).
It was very much an 'energy fighter', being fast and powerful, while the Snipe was a 'turning fighter', being agile and manoeuvrable.