lol. I hope it's not taken wrong to laugh but, I don't agree with all that Dr. Umar stands for either. Some of what he says fits into the exact description you give to the point, it made me laugh. On the surface, he offers comfort food, and sometimes comfort food can be bad for us.
But on a deeper, more histoical level, do I see this as being a reality. But let's not only look at the UK now, but on a global level.
Do you know about the history of Genghis Khan? I am just learning about this and applying it to my other research. Genghis Khans grandsons come from a Keraite mother [ie. KARAITE, meaning Black Israelite]. HIs four grandsons leveled the Keraite empire and the Islamic power and political structure. It was a full blown genocidal attempt on the Black men. The Mongol force swept west all the way to Palestine and then turned to Egypt, but they were stopped by a force much like them. So yes, I do believe that this bi-racial woman was a planned event due to a global issue on a large scale and not just to be divisive on a gender basis.
The ancient Persian empire do the same. The marriage to a Black woman became a positive aspect though, in this case. The Persians supported the cultures of many and they did not wish to destroy others in the quest to be the head. It is not the same in other governments though. But political and arranged marriages should not be taken for peace or just for love. In my opinion.