pointythings
copied and pasted from the New Statesman, so that you don't need to use your two free articles to check
I can see some of the article - from what I can read it doesn't back up your claim that the note was left 'by EVERY outgoing government to the incoming one since the 1930s' -
Leaving the Treasury after Labour’s victory in the 1964 election, the outgoing Tory chancellor Reginald Maudling wrote a note for his replacement, Jim Callaghan, or possibly (accounts vary) spoke to him in person: “Good luck, old cock, sorry to leave it in such a mess.” Callaghan thought he meant the office, not the economy; and while Labour did go on to win more seats at the next election, Maudling’s self-deprecating joke had very little to do with it.
Nearly half a century later, on the day Gordon Brown called the 2010 election, another team was preparing, in all likelihood, to leave the Treasury. With some sense that there was a tradition of ministers leaving advice for their successors, one, Liam Byrne, scribbled a one-sentence note for whoever that successor turned out to be: “Dear chief secretary, I’m afraid there is no money. Kind regards – and good luck! Liam.”