When I joined the world of tax after qualifying as a chartered accountant in 1982, my 'bible' was the Yellow Tax Handbook. For some time there was just the one volume. (Yes, I know there was an orange one too, but that had stuff in it I rarely needed back then).
By 2001 the Yellow book had expanded to two volumes. In 2007 it was four volumes and now, for the first time it's a five volume colossus.
Couldn't decide whether to post this here or to add some commentary on the TaxBuzz blog. Guess it's only the title that's vaguely amusing really. The ever growing quantity of tax law is no joke! (I commented on this a year ago: Twice as much tax law under Labour as in previous 18 years)