The Germans think they have destroyed half the RAF's fighter force, and that their bombers are only being intercepted because the RAF is bringing in reserves from the north. So they decide to bomb the north with squadrons from Norway, which means they won't have fighter protection. The first raid crews are nervous, and have just gone to action stations. One of the gunners sees something, "Achtung! Spitfire!" OneSpitfire. The entire bomber formation breaks and scatters, and it's several seconds before we see a squadron coming in to attack.
One British pilot bails out, and ends up crashing through someone's greenhouse, in front of a stunned boy. While the pilot tries to extract himself, the boy runs inside... and comes back out a box of cigarettes, offering one to the grateful pilot.