Continued...
You further state, “If a workforce doesn't represent the population because of past discrimination how would you change it?”
I wouldn't change it unless it needed changing because it was ineffective. Why should a workforce be representative of a population? Does making a workforce representative of a population demographic make a business more profitable or a more pleasant place to work? No, because your gender, religion, ethnicity, etc. is an irrelevance. What's important is the ability to carry out your duties effectively.
What you're suggesting is this: A particular Indian restaurant employs 25 Indian staff. According to recent figures, Indians in the UK represent about 2% of the population. Therefore, if we're living in positive discrimination land, then in order to accurately represent the racial demographic, the restaurant would have to replace 24 of its staff with 'non-Indians'.
Fair? I think not.