I did read and respond to that definition, Tim, and Pip just reposted part of it

Not that I noticed. (Nor, of course, did you answer my direct question. I suppose I should be used to that by now.)

Look, here's the UN definition again:

The term "racial discrimination" shall mean any distinction, exclusion, restriction or preference based on race, colour, descent, or national or ethnic origin which has the purpose or effect of nullifying or impairing the recognition, enjoyment or exercise, on an equal footing, of human rights and fundamental freedoms in the political, economic, social, cultural or any other field of public life.

In other words, deciding on the basis of race, colour, descent, or national or ethnic origin that one group or another should not enjoy fundamental freedoms in the political, economic, social, cultural or any other field of public life on an equal footing with all other groups. Such as, for example, the fundamental freedom to move to another country if that's where the work is, or the fundamental freedom to choose what you wear, how you worship and what kind of music you listen to. You are self-evidently committed to restricting these freedoms on racial grounds; hearing you deny it would be laughable if it wasn't so sad.

as for "we'll all be better off if immigrants maintain their own culture" (Pip) I (and as just said, apparently, New Labour with their new English tests) question this on many grounds

But WAV, "when people lose their culture society suffers" (your own words). Are immigrants not people?