Light Levels
Light Levels may also have been a player. Here are some figures from May 1941. The figures are in Millilux. The Moon was at 25% phase and 17 degrees below the horizon on a brg of approx 330 degrees.
Can't fettle the table to display, but the light levels were at TWO at the time of the crash. (Time/Millilux) 2100/19, 2200/12, 2300/8, 0001/4, 0100/2, 0200/2, 0300/9
It was dark! (as Albert Driver mentioned)
PS The cloud cover drops the figure to 0.9. Much darker.