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Yes, Ankou, I guess I was talking genes.
AOG, I think it's fairly well known that if one, or maybe two black people had 'bred' (sorry, I can't think of a suitable word) with white people then, without any further black genes being introduced to the lineage, those born several generations along will betray no outward sign of their black ancestry, except, perhaps, for the isolated that pops up once in a few generations (a bit like the 'ginger' gene).
Modeller, I've read about the vitamin D theory elsewhere. Apparently melanin filters out the sun's rays. As you've said, we need sunlight for our bodies to make vitamin D, and in this part of the world we have to make the most of what little sunshine we get. With dark, melanin-rich skin, this is going to be more difficult, hence the deficiency.
It would stand to reason that those with the most suitable genes for our climate will be the ones whose children are stronger and healthier in it - viz. the fairer skinned ones.
To go back to my original question, though, do we know whether Nick Griffin has any black/Asian ancestry - maybe some slave or Raj genes? Would he be allowed to be a member of his own party? Or would he, as he wants so many people to do, have to return to his own country?