They were in San Diego, 2600 miles away. yep, the Americans screwed up the early warning, but whatever mistakes the Americans made ( many) doesn't mean the British get a pass for mistakes they made.
It's not a question of the Brits getting a pass. My frustration is the rather binary approach that some are taking regarding this sub-thread discussion. Some very bald statements about RAF pilots having "zero" air gunnery training, coupled with continued use of spread gun alignment into the BoB are patently untrue. The RAF did train in air-to-air gunnery in the 1930s and re-emphasized it starting in August 1940. There was a period where ab initio pilots coming through the flying training system lacked basic air gunnery skills but this was primarily due to the greater strategic need to keep front-line fighter squadrons at full strength, even if the new arrivals had to learn on-the-job.
It must also be remembered that, from May 1940 onwards, the RAF found itself in a position that nobody (repeat NOBODY) expected, with Britain's key ally, France, having surrendered and German fighter aircraft operating from airfields within reach of the UK. I suspect the hiatus in air gunnery training aligns quite well with the period May-September 1940 when the RAF desperately needed pilots, resulting in the drastic cuts made to the training schedule.
It's been suggested that RAF squadrons in rear areas weren't doing anything to improve gunnery skills. I have no idea whether that's a valid criticism or not, although it seems pretty clear that all of those units were put in the rear to integrate new pilots, re-equip and train ready to go back into the front lines. It would therefore seem obvious that squadron and flight commanders would take time to train new pilots in the skills they needed to survive and contribute to the squadron's effectiveness. That has to include, in some measure, air-to-air gunnery. To suggest that operationally experienced leaders directly tasked with recuperating their squadron would simply let new pilots go into combat without any sharing of operational experience is nonsense, as many contemporary testimonies and unit record books attest.
Thach was one of the supreme fighter tacticians of his age. However, he had the benefit of time to train his squadron in gunnery techniques that proved valuable and relevant. Others, who suggested that modern fighter engagements with closing speeds in excess of 600 mph would make accurate aiming impossible, were patently wrong. However, the inaccuracy of that perspective became abundantly clear very early in the fighting. By the BoB, the RAF was harmonizing its guns on a single point. Yes, some pilots opened fire at overly-long ranges but we'd need to understand the tactical situation to see whether that was valid. If you're tasked to bring down the bombers but are about to be hit by the escorting enemy fighters, some pilots may have thought it better to have a quick squirt at range in hopes of hitting something rather than trying to close to a better range and risk being shot down by the escorts. I'm not going to second-guess those kind of split-second tactical decisions. Not every squadron commander was a Thach...even within the USN.
Was RAF gunnery training non-existent? Patently not. Did individual squadron commanders strive to enhance the operational effectiveness of their units, to include gunnery training? Yes. Could RAF gunnery training have been improved? Possibly. However, the strategic and operational situation in the summer of 1940 led to cuts in training hours because, at the time, people didn't know how long the BoB would last. Reducing training may seem callous to some while, to others it was "stupid". From what I've seen, Dowding and Park had a very clear understanding of how to conduct defensive fighter operations and the operational and strategic imperatives.
This whole sub-thread discussion reminds me of the 3 parameters of capability deliver (fast, good and cheap), with the recognition that you can only ever have 2 of those 3 factors. Ideally, in the summer of 1940, the RAF would have emphasized good training but the strategic situation demanded the provision of new pilots quickly. To get good pilots fast is hard, and the training system was already at breaking point.