The Wyse terms I have been dealing with werent added to the domain by me.
I just went and flattened one and rejoined it to the domain - low and behold!! - the script runs!
Admittedly the printers dont map through - but thats my group policy kicking in - just need to sort that out and (hopefully) I should be sorted!
I get the feeling someone has been mucking about with local policies on our Wyse terms - havent gone through that yet - but will do some digging
Thanks for your help guys - might still have more questions later - will let you know how I get on (I must also say, its very refreshing to find a forum where pepole actually reply with positive help ....other than "yeah, I have that problem too") - ;-)