'and could see west Europeans and Britons required to have US visas'

I'm British. I have never been to the USA, but I understood a visa was already required and that it took months (or at least several weeks) to arrange. Am I wrong?

'...Headquarters of the most colorful super-hero combo the civilised world has ever known!'

So is there a super-hero combo that we've never heard of, in the jungle somewhere?

I was at school in England when this book came out - it's crap! Even back in the 70's it was seen as part of a disinformation programme: the recipes don't work; most of the information is wrong. It was widely believed to have been written by the British Secret Services!