You can set up sub control panel access using the following steps:
Log into the control panel http://cp.xcalibre.co.uk
Go to the Control panels > Add section
Select the Package you want to add this to
You will then be able to input an username and password, and select all the functions you would like them to use and select Add.
From this control panel your clients could see their FTP login details, see their email settings, webstats and various other informative settings.