Yeah, yeah, I know, been done.
But: The no-confidence vote was 311-310 in Callaghan's favour. We're a coin toss away from a tie or the dissolution of the government. Even without that, October's a hung parliament and it would only take a few constituencies for a Conservative majority.
For a start, does the Falklands War happen without the 1981 White Paper and HMS Endurance being pulled back?