book published in the late 60s
custom one ordered a few years later, maybe?
( Azra3l Lubrication Persuasion and Brute Force ™, Tue 12 May 2009, 1:47, archived)

1971 seems to be the first edition,
the above citation appears to be some kind of paraphrase of Ladybird's own text on the subject, which doesn't mention a date but has simply been assumed to be in correct chronological order.
www.ladybird.co.uk/aboutus/companyhistory.html
( Moon Girl Technologies horrendous beanbag, Tue 12 May 2009, 1:51, archived)

ahh ahaha
1969
( Moon Girl Technologies horrendous beanbag, Tue 12 May 2009, 1:53, archived)

so..
the 60s then... ;p
( Azra3l Lubrication Persuasion and Brute Force ™, Tue 12 May 2009, 1:59, archived)

by the skin of your teeth :D

( Moon Girl Technologies horrendous beanbag, Tue 12 May 2009, 2:00, archived)