New video, this time focusing on the Boulton Paul Defiant.
Nice! Watched it, very interesting.
A few minor things, more as additional background info rather than corrections to your excellent work.
1. When the concept for the turret fighter was drawn up, it was to operate in conjunction with single-seaters, the idea being that the Daffys would break up the bomber formations by diving among them and whilst the bombers separated, the single-seaters were to chase the stragglers, or that was the theory. Defiants could fire the guns forward as the pilot had a trigger on his spade grip an there was a switch in the turret that enabled the pilot to fire the guns, but the pilot had no gunsight and the guns were not synchronised. This was rarely used, if at all because the switch was largely wired shut on in-service Defiants.
2. The Hawker Hotspur programme wasn't so much delayed as Hawker at Kingston had little interest in it and work on the prototype was put off and resources diverted to other things, so it took longer because of apathy rather than delay! Eventually the Hotspur prototype went to Farnborough where it assisted in the development of dive flaps for the Henley dive bomber.
3. When the tactical trials were flown in October 1939, the pilot was Philip Hunter, who became 264 Sqn's CO and an advocate for the type, ace-to-be Bob Stanford Tuck flew the Hurricane, and Hunter made it very difficult for Tuck to get in a firing position despite the Hurricane being faster and more manoeuvrable, to the extent that Tuck failed to do so while the Daffy was in Hunter's hands. Sadly, Hunter eventually disappeared on ops in August 1940; he was pursuing an enemy aircraft out to sea and never returned.
4. The Lufbery Circle tactic was also Hunter's doing and the losses suffered by 141 Sqn's Daffys was preventable as the CO of that unit had little faith in the type and despite Hunter recommending tactics, he did not take them up, to the detriment of the Defiant crews lost. This incident was known as the "Slaughter of the Innocents" and was terribly unfortunate, but the Daffys were bounced by around 30 Bf 109s, so they were desperately outnumbered to begin with.
5. Although the Defiant made a good night fighter, it was only intended on being an interim until the radar equipped Beaufighter II appeared in larger numbers, the problem was two-fold; radar sets didn't perform as well as expected and the squadrons had difficulty with them, and the Beaufighter II exhibited terrible handling characteristics on the ground and killed a lot of trainee pilots, even experienced pilots called it a devil of a thing, but of course, that's outside of the scope of your presentation.
6. The principal Defiant night fighter OTU was No.60, which was the biggest single operator of the type, with more Defiants going through 60 OTU's books than any other. Night fighter training was also conducted with 54 OTU, and that carried out by 60 OTU in Scotland was eventually deemed unnecessary and night fighter training was consolidated at Charterhall, Northumberland with 54 OTU and 60 OTU had been disbanded by the end of 1942. Charterhall became locally known as "Slaughter Hall" owing to the large number of tyro night fighter pilots flying into the ground.
7. A wee note about operators, neither the Royal Australian, Royal Canadian or Polish Air Forces operated the Defiant. The squadrons that operated the type had affiliations with these foreign countries, but they were under RAF jurisdiction, the Canadian and Aussie units being designated either RCAF or RAAF, but they were in fact under RAF control. These were the 400 series RAF squadrons formed under Article XV, although the Polish units in the 300 range were simply Polish squadrons of the RAF. Following the war, some of these units went to their respective countries, which adds to the confusion, but during the war they were RAF units.