Oops..
I went through all the posts on the forum one by one and tried every solution mentioned regarding the initialisation files and the auxconfigdir. I now have a fully functional ACS/pg!!(apart from some small tweaks - hopefully)
The solution that worked was to use a nsd.tcl file and to add the line
source /web/${server}/parameters/gacs.tcl
Not only is the system working, but now both initialisation files are .tcl, which is where we were aiming....
