I know it seems racist to say this and I don't want to be that way but as others have said this would not have been a multi-cultural society at that time. For some of us and what we know about the Darling buds of May etc adding characters of non-Caucasian ethnicity is just more tokenism and sometimes we could live without it. Not that it doesn't have its place it's just lets make it appropriate. Anything else is patronising.