Captain Hazelden was chief test pilot of Handley Page Ltd and spent ten years on the Herald development, he piloted the modified HPR7 G-AODE that crashed at Godalming in 1958. This was caused by an uncontained LP turbine failure on the No 2 engine, however despite this Sqn Ldr Hazelden wrote very warmly about the Dart Herald in the introduction to the book by G Cowell, he compared it to the F27 and the HS748 and in his opinion the Herald was the nicest to fly.