Yes, but even if it was the British Empire alone I stated it had 1945 holdings, so it would still be missing a lot, particularly Africa. I noticed the Falklands were not marked as British either. I can provide a map for reference...

www.ict.griffith.edu.au/wiseman/BritishEmpire/World1945d.gif

Also, I just realised that when I was looking at the map you made, can't believe I missed it when I read your app xD 

Looks like its good old argument time IC xD