Tondelayo Go and buy the magazine Chandler - I've put in that their ethnicity is based on my perception. Feel free to do your own research.
I can't - ironically, I'm visiting family outside the UK. What I do have in front of me are the UK Closer magazine - one out of four on the cover are black (Mel B). And Heat UK magazine - main picture is Kanye West (black) and Kim Kardashian (North African ancestry). First feature is Kanye and Kim. After that a page with Taylor Swift, Katy Perry and Rhianna. Opening up Closer magazine, first five articles include one on Kim and Kanye and one on Jay Z and Beyoncé. Theres also minor articles with black people in them - but they are all there on merit, not some head count.
But I see plenty of black models in UK fashion magazines. Its hardly rare. I would have actually made an educated guess that UK models are in a minority even in British fashion magazines, since there are very few British women that have the build and appearance suitable. Most models come from Eastern Europe and increasingly China and African nations now, don't they?
I'm not being funny, but there was a thread on racism in the UK on mumsnet a week ago, and it ended badly - it seemed to end, to my perception at least, in bullying and closing down anyone who had an alternative opinion, and some posters seemed only interested in pushing their own opinions on others very forcibly, rather than having a discussion.
What I would say is that there is a cultural dimension to the lack of inclusion of Asian women from certain parts of Asia - but please, don't lets assume that all Asians are black or similar, that's really offensive.