"I would like to audition, but I'm black"
Obviously we (Laura as representative) replied immediately to let the person know that skin colour or ethnicity, is no barrier to working with us, but this warranted a bigger clarification.
In South Devon, where we are based, the local demographic is less "diverse" than in other parts of the country, but that does not mean any kind of discrimination in our cast or crewing. There is no issue about skin colour, religion, ethnicity, LGBT orientation, or anything else like that. In face we have quite a diverse team, who all produce incredible, world-class work together.
Selection in castings is based entirely upon auditions and professionalism, as stated in our audition page , and there are no other criteria, either overt or covert. No other details have any relevance to the selection process.
On a wider scale, discrimination on such grounds is not only unethical, it is also illegal, and should be reported to Equity or a similar authority.