I am still unable to use NSM as when I go into NSMAdmin I get the
message "Access denied because you do not have the appropriate rights".

I am logging in as an admin user with full eDir rights (I've tried it
with Admin and a couple of admin-equivalents.)

Initially I was able to use NSMAdmin, but I think in having a "play" I
have changed some setting and hence locked myself out.

Is there anyway to reset things, or are there eDirectory objects I need
to change access rights to? Or can I uninstall the product and
re-install? (I couldn't see it using nwconfig.)

Any advice gratefully accepted - I need to modify some policies by the
end of the week so I am getting a bit desperate!