That's a very interesting link you've given claig in that it talks about MIND.
It appears that in 1975 MIND was discussing sex between people with mental disabilities of whatever kind and none.
That's what pressure groups are for. They want to protect people from predators but also to free them from moralisers. Some of them even shape their own policies - fancy that, eh?
Twenty-odd years ago I met someone who facilitated the marriage of her Down's Syndrome daughter to a DS man and faced disgust from neighbours at the idea that they would be having sex.
They even got a petition up to the council to try to stop this filth from happening in their street. I kid you not. It failed.
To my mind, they were disgusting, dirty-minded people who wanted to dabble in other people's private lives.
I can't begin to say how wrong that is. There was even a recent storyline based on facts on Call The Midwife set in 1961. Sadly, it didn't end as happily.
Bearing in mind it's Wikipedia, I would still take it that Keith Hose of PIE was up to no good and hijacked them. But it appears that his 17-page document proposing the abolition of the age of consent was shelved.
So, as we say in newspapers: 'Earthquake, no one died'.