Representation of Ethnicity

Ethnicity is a very sensitive subject in modern day television - but look at how things have changed since these two examples from the 1970's - what we consider to be 'racism' today was in fact, the 'norm' for a lot of people in the 1970's. Attitudes towards the influx of migrant workers (mostly West Indian and Pakistani) were very similar to what we see today from far right groups towards the issue of immigration. Only this was the attitude of your next door neighbour.
Many issues with ethnicity have been highlighted by TV in various sitcoms and dramas, which ones can you think of?