GB was asked if there was any possibility that the handcuffs were already in the house, and he said that he thought they might have been.
If the killer found the handcuffs, then presumably it would have been when he made Janet put on her jewellery.
The panic button stuff is confusing. There were two alarms and IIRC the external one was heard at 10pm but not at 10.20pm. The other alarm rang continuously until switched off, but was it triggered around 8.20pm during the break in, or later in the evening?
I agree, there are so many unanswered questions in this case.
My questions alone:
In the Crimewatch reconstruction, Janet tells her daughter she is tired and going to bed. It is shown that she takes this and her final call, at 8:10pm, downstairs in the lounge/living-room, but how can that be? The perpetrator was almost certainly outside at this time, trying to get in with the glasscutter. Wouldn't Janet have seen/heard them? If not, they must have seen her, which is disturbing.
This is only intriguing to me, as 10 minutes later she doesn't answer the phone and it is assumed that by then, she was incapacitated. But Britton says her clothes were folded at the end of the bed and the sheets were crumpled. So in only 10 minutes she went upstairs and prepped for bed while the suspect was breaking in and didn't hear them until they entered?
That said, the reconstruction does show there is a second phone upstairs on the bedside table, so I guess it is also possible she that she takes the calls in her room, and she is already in bed.
Then there's the issue of the patio doors. We know the suspect went to great lengths cutting a man-sized slab of glass, not realising it was double glazing. They subsequently smashed through the second pane, but why was more glass found outside than in? How did they enter, if not there?
Another - If Janet pressed the panic alarm at 8:20pm, then the perpetrator clearly endured the ringing for some time. How did they know the alarms were not linked to police? Or that no one would appear? In that time, the lights were on, Janet was moved around, made to put heavy jewellery on, cuffed, tied and untied by her ankles, and perhaps sat on (according to Paul Britton). This person had to be really sure they wouldn't be caught. They have to have had detailed knowledge of the family dynamics.
Finally, if nothing was taken, why do the police believe it was a 'failed' robbery? As far as I've ever read, evidence only points to the suspect nosing around the house (only scubadiving gear hamper was open). So what leads them to this theory? In Britton's book, he says the police held back some 'operative' details. I wonder what they were?
The biggest of all. Why didn't they strike again?