Look at this:
http://www.channel4.com/bigbrother/g...0_nomtime.html
Theres a few pics of the HMs sitting down, from looking at the pics, it looks like Lisa, Freddie and Karly are missing.
And Hms have to sit there at the whole duration of the nominations, must be, its not like its 1 person missing (as they could be in the DR) its Karly, Freddie and Lisa, and they cant obviously be nominating together.
This is just my thought.