Thanks guys for all your reply's. I'm just flicking through a magazine to buy a flexible lamp with a magnetic base for the lathe (xmas present from in-laws) and just reminded myself the cost of how much a second chuck would cost.
Imagine saying to SWMBO that i would like a second chuck because it takes ten minutes to put on the cole jaws and saying "Maybe you could just not go clothes shopping for a little while, you know i'm worth it.............."

Mark