Sadly, this doesn't seem to be on the Net anywhere. I heard it on the radio, on the morning of the 2nd of May, 1997. John Major would go on to make a proper — and perfectly decent — official concession speech later on, but his impromptu one was better.
You could hear all the assembled Tories had been drinking through the night. Much rumbling and kerfuffle and laughter. Then a lot of ssshing because the now-ex-PM was going to speak. Everyone quietened down. And Major said, quite cheerfully — even over the radio, you could hear his smile — "Well, we lost." And the assembled throng of Tories immediately burst into drunken cheering.
He then went on to give a rather good speech. But it is that excellent beginning that stuck in my head, and the cheering of the losers that greeted it. At the time, I just thought it was fun. In retrospect, it turned out to be an all-too rare example of how to lose decently.
If you've just lost, and you want to look good, and perhaps you fancy persuading people you're not a narcissistic tosser, have a drink and a laugh and celebrate.