rob, I do infact have that copy of Sky and Telescope and will dig it out and reread it.
You certainly improved my pic a lot
Sadly I did not get to have a go at it last night, the clouds rolled in and stayed. Then at about 4:30AM the rain started, and its not looking good now for the next few days.
And I will see if I can get hold of a USB hub to test with.
Thanks for all the help