Steve, I just checked and the teaser is on first, then comes the Mystery Movie intro.

As mentioned in the end credits of each episode, the Mystery Movie intro has a theme composed by the famous composer Henry Mancini (also the author of the Pink Panther theme, for one). It's quite a catchy tune.

Cheers Pete The Finn. I'll see if I can get that DVD. I always think it's a shame when these little bits of presentation get chopped off when old shows are released. They're not that important, but it's nice to have them on there.