I for one have never come across the Avro suggestion or indeed that it was turned down because of the views of aircrew, but I stand to be corrected. I think a lot of people miss the point. The Germans didn't have to worry about the mosquitoes too much as the brunt of the force were the heavies. The Germans did use nitrous oxide injected Ju88s to hunt mosquitoes and were successful. If the game had changed then the Germans would have adapted accordingly. They were an ingenious and formidable foe. The Ju88 was responsible for more nightfighter kills than all the other German types combined. If higher flying heavy bombers had evolved, then the Germans would have had an answer.