Thanks to all:
Chaps thanks, I have printed it all off,after showing the girls the reply's,
The 9 yr old says its all very interesting but very complicated (Quote).
The 12 yr old, says why do people complicate a very simple process, like climbing a ladder? told you it could be done Dad (quote).
Genghis I will source a copy of the book, and will read it myself before I pass it on to either of these two.
H'snort