Ok, for those who dont know what I do now .........With a little help from a friend
Step 1:- Have some friends to recieve a "group" PM
Step 2:- If you decide you want to reply to them all, select them all as shown
Step 3:- Right click the blue bit and select copy
Step 4:- While this is selected click "PM Reply"
Step 5:- In the user names box Right click and paste
Step 6:- Ta Da
Step 7:- Arrange as shown so each user name is on a different line and click the "Add [To]" Button
Step 8:- All done