Craig, I've just noticed that the book -
Chambers Crossword Manual - that many setters and solvers consider the crossword 'bible' over here (in fact, I used my battered old copy to 'borrow' some of those clues from

) is available on Amazon.com
HERE.
Author Don Manley is a long time composer of great esteem, and is highly respected as one of the finest of all time.
I'd highly recommend anyone with an interest gets themselves a copy.