IIRC there were two periods when RAF fighters featured black port wing undersides - first lasted from April 1938 until early June 1940 and the second one from the end of November 1940 till April 1941. During the 1st period the starboard wing underside had to be white, while tailplanes and fuselages (although ordered to be divided black/white along the aircraft centreline) were sometimes left in silver or natural metal. During the second (brief) period only port wing had to be black - tailplanes, fuselage and s/board wing remained in Sky Type S.
Of course the "black wing" scheme has been applied not only to the single-engined single seaters. Photos of Defiants, Blenheims and Whirlwinds with black port wing are widely known. But there are some pictures showing army co-operation types (Audax, Tomahawk) featuring black port wing. Is it possible that any Hurricanes, Blenheims or Audax with black port wing were still in frontline units during the early stage (up to May 1942) of the war against Japan?
Cheers
Michael