dts doh!

I have found why my dts didn't work. in the copy tab of the copy object task there is a check box for use default options. i had kept that checked.
If you untick it and click the "options" button you then get a new form with a "copy database users and database roles" checkbox that is selected by default.

Oh well thats something i've learnt today (along with the existence of a goggomobile http://www.motorbase.com/vehicle/by-id/114/ )