Just to add a few thoughts to the debate on black/white undersurfaces,I’d always thought it was done to identify the aircraft as friendly,just like the later D-Day stripes. IIRC,the scheme was replaced by black and white stripes in time for the Dieppe raid in 1942. Can’t rememebr where I read this,it was a few years ago now.
Adding to Mark12’s reference to Spits in 1941 with the Night & White scheme,I’ve seen some pics of Hurricanes in N Africa and Malta around the same time with the same scheme. BBMF’s PZ865 was painted up in just such a scheme a few years ago…