Two references come to mind – the first is that the Avro C102 was beat by the de Havilland Comet, which was an example of a bad design with a good presentation. It had a series of mysterious hull losses that were eventually attributed metal fatigue accumulating around a square cut-out in the hull.

https://en.wikipedia.org/wiki/De_Havilland_Comet#Comet_disas...

The second, more depressingly, is that the Avro C102 was cancelled to redirect resources to the Avro Arrow: Canada's mythical last jet fighter, of which only a handful were produced before the program was (painfully) cancelled, and Avro wound up. IIRC, the Canadian government was the main-to-sole bankroller of the project, and ballistic missiles became increasingly more important.