Thanks for that murr.
I think my best bet is to just make a backup of my current campaign profile,and install Comm. straight over the current game version i'm using,and if I run into any noticeable problems I still have my old backup.
Lastly,regarding problems during mid campaign,1 or 2 people in here have said that it shouldnt cause any problems,but with the other major add-ons I would need to start a new campaign.
As I say,i'll give comm. a go in about 30mins (dl time remaining) thats bleedin dial up for you
Cheers anyway pal