That sounds what I was after. Let's see if it works for me.

Here is a clip from a film I saw this week - Sunshine on Leith

And it works ! Thanks. The Mudcat always comes through.   

Great little film, see it if you can.

They don't make it too easy finding out stuff like that, do they? The term is "intuitive", I suppose. Any time I hear it my heart sinks.