Вот, кстати, по теме:

"Because a number of German rescue and Red Cross planes [ Document-25 ] had been detected on observation, photographic and possibly other missions as well as carrying out their primary roll as search and rescue aircraft, the Air Ministry on July 14th 1940 gave instructions for them to be shot down if they were seen near to allied shipping or close to the English coast. One of these Heinkel 59 rescue planes was spotted by 111 Squadron Croydon (Hurricanes) and shot down. Whether they were in their rights to do so is a debatable question as they were about 10 miles to the east of Boulogne off the French coast. The time would have been at around 1500hrs as they had taken off at 1435hrs. As the crew of the He59 scrambled in the water another He59 made a landing closeby to rescue them and a Hurricane of 111 Squadron Croydon flown by F/O H.M.Ferris strafed the second He59 causing damage, but it managed to take off and make for safety. Another He59 was also shot down by 111 Squadron whilst on a search and rescue mission at approx 1530hrs.

In all, a total of 18 German aircraft had been shot down, and the shooting down of He59 search and rescue planes caused Hitler to proclaim that the RAF in attacking unarmed aircraft with defenceless and injured personnel on board nothing but cold blooded murderers."
http://www.battleofbritain.net/0022.html

Так что они не просто так летали, шпионы фиговы