Humm. I wasn't looking for anything as complex as that, just a way to set up gamma etc. correctly. I don't really know what I'm doing, I just wanted to make sure it looked pretty much as it was supposed to (the monitor is well over three years old now, so I thought it might need adjusting). Perhaps calibrate was the wrong word to use (technical term??).
CP - I tried that first link, and it asked me to click the shade of colour (black, white, red, green, blue) that best merged with a background pattern. And nothing else. It just said "congratulations, your monitor is now set up correctly" when I hadn't actually done anything. Am I missing something very obvious, or what?

Thanks guys.