'Noughts + Crosses' is set in an imagined future where the prevelance of insitutitonal racism is somewhat more severe than it is at present, albeit less extreme than in, say Apartheid-era South Africa. The twist is that the story is set in a Britain that has been colonised by Africans. It's interesting to think about how African colonialism might have differed from the European form we actually had, but although the drama makes some nods in this direction, it's alternate history is insufficiently detailed to fully flesh-out a wholly different culture. Instead, the main purpose the swap serves is to force a contemparary white British audience to question our own assumptions about what is normal and natural. And there's nothing wrong with that, per se, but I found the programme rather obvious in its moral messaging, it's characters too embelematic to be cared about. One of the characters is even the Prime Minister, but the lack of detail in the policking we see is typical of the drama as a whole. To really tell a good story about racism (or indeed anything) in general, you need to have the confidence to tell a story in the particular; and that's what I didn't find here.