Dr. Corley Walker
Does anyone else think this was entirely strange? What was Diana doing with this?
First - Dr Walker slags Christine Walsh off to an amazing degree - something you think he would be afraid of doing given the climate of fear the Visitors were creating - and basically calls her a traitor.
Then - less than a week or so later - he is basically sucking up to her.
If this was you, wouldn't you start to suspect something was going on?
So - why did Diana do this? Why not simply have Dr Walker "vanish"?
I can think of one or two reasons. First - Diana is so sure of The Visitors control that she is happy to flaunt the power they have, or secondly Diana is not capable of realising how dangerous what she is doing is - she is unbalanced in someway.