British Go Journal No. 65.  July 1985. Page 29.
This is the answer to the problem on page 12 .
Black proceeds with the ladder anyway.
White's ladder breaker doesn't work - it only suceeds in turning the ladder in a different direction!
I am ashamed to say that I was white in this game, and that my opponent, Sam Perlo-Freeman, spotted what was going on before I did.
There is a proverb that says, "if you can't read ladders, give up Go"; you can see why.