The clip of Julie Mugfords interview, when she claimed Bamber confessed to her he carried out the murders, her pupils were extremely small considering she was interviewed indoors, was she masking a Lie ?
I need to look at the whole film as I saw only snatches, however, my initial response to what I saw of JM's interview - and I could not hear any of this - is that her eyes made me recall something I've read about the body language of the eyes:
"The eyes are often called, with some justification, 'the windows of the soul' as they can send many different non-verbal signals...
Looking up
When a person looks upwards they are often thinking. In particular they are probably making pictures in their head and this may well be an indicator of a visual thinker.
When they are delivering a speech or presentation, looking up may be their recalling their prepared words.
Looking upwards and to the left can indicate recalling a memory. Looking upwards and the right can indicate imaginative construction of a picture (which can hence betray a liar). Be careful with this: sometimes the directions are reversed -- if in doubt, test the person by asking them to recall known facts or imagine something.
Looking up may also be a signal of boredom as the person examines the surroundings in search of something more interesting...
Looking sideways
Much of our field of vision is in the horizontal plane, so when a person looks sideways, they are either looking away from what is in front of them or looking towards something that has taken their interest.
A quick glance sideways can just be checking the source of a distraction to assess for threat or interest. It can also be done to show irritation ('I didn't appreciate that comment!').
Looking to the left can indicate a person recalling a sound. Looking to the right can indicate that they are imagining the sound. As with visual and other movements, this can be reversed and may need checking against known truth and fabrication....
Lateral movement
Eyes moving from side-to-side can indicate shiftiness and lying, as if the person is looking for an escape route in case they are found out.
Lateral movement can also happen when the person is being conspiratorial, as if they are checking that nobody else is listening...
Limited eye contact
When a person makes very little eye contact, they may be feeling insecure. They may also be lying and not want to be detected."