Royston, re your "Look, I'm so sick of wasting my time on Keith's contorted and fantastical half-truths. I just googled 'size uk gay population' and learned enough to know what I suspected - that this 1 percent thing is yet another of Keith's more pernicious concoctions. There are a range of estimates, the page on the subject from avert.org.uk seems quite balanced."

This is from the Gay Men's Sex Survey, funded by the Terence Higgins Trust and the Department of Health
The Census tells us how many males there are in the
UK and this is our starting point to describe the age
profile of all men that have sex with men (MSM). The
National Survey of Sexual Attitudes and Lifestyles
(NSSAL) tells us the proportion of all men that are
homosexually active. We estimate that right now in
the UK, there are 500,000 men who will have sex with
another man in the next five years
http://www.sigmaresearch.co.uk/files/GMSS-BS1-age.pdf
(500 000 is less than 1% of the population.