Royston, re. your"What I said, about "the Africans", is that adding their number into the number of white UK HIV carriers in the "straight" pool, multiplies further the risk of any one straight person, who practices unsafe sex, contracting HIV if all other factors are constant"

You might well expect that, but the figures show that it is not happening.

re. "Yet 2000-2008 the number of white straight people contracting HIV each year in an enormous pool with only a small starting number of carriers, grew 5 times."

Yes, a steady rise. Choose an earlier year and you would get 10 times, a thousand times and so on. After all these years it remains an incredlby rare disease in this population

re "Whereas gay men, allegedly unhygienic and certainly more exposed to HIV in purely logical, accidental, epidemiological terms, less than doubled."

This population experienced exponential infection in the early years.
In any population you reach a limit on that kind of growth. Now it just picks off new members.

re. "for straight HIV+ numbers to have increased so dramatically. It's bleeding obvious that if their behaviour stays the same, and the numbers of HIV+ straight carriers keep growing, there is very big problem coming."

In about 140 years it will cease to be classified as a rare disease.