Duno if this is helpful or not,
I've read hundreds (literally) of BoB era pilot's accounts. The only time they mention being able to hear enemy aircraft is when they were extremley close. It seems to happen more with head on attacks and almost always the pilot says something like "I was so close I could hear the engines" Geoff Wellum, Peter Townsend, one of the Dundas brothers (can't remember which one), Brian Lane and quite a few others.
Another similarity is that this happened as they broke underneath the enemy after a head on attack - a bit closer than they'd like 5-10 meters. I'll try and dig out some of the quotes, one of them was a mid air collision with a 109, the pilot said he heard the 109 just before they crashed.
I also recall one Spit pilot flying in cloud with his canopy open hearing a LW Bomber before he saw it, it was about 10 meters off his wing.
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