This article by Tony Blair’s former speech writer contains a shocking revelation:
A few years ago, I took the Conservative manifesto for the 1997 general election, deleted all the insulting references to the State that would never appear in a Labour document, and circulated the expurgated text as if I had thought it all up myself. My colleagues in Downing Street thought it was an accurate but uninteresting account of the Labour Government’s policy. They were mystified as to why I thought it worth sending round.
It does remind me of the final sentence of Animal Farm:
The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which.