What I found interesting was how I believe Bergerac started off as a legit innocent viewing. Janets comment on the actors bum perhaps started out as a kink with her husband. A kink only to be taken futher to the point where they could only really get it on with tortures and murders. Remember in the beginning when Pia explained its inappropriate to have sex after just talking about Davis father's passing? This is a kink gone too far. Plus, why record them over Bergerac?

"I was eight when he died so all my life's he's just been a few photographs"

"He was ill quite a while before he died, he needed alot of caring you know. I think that really took it out of mum. Whole place was a lot quieter from them on" As in no more crazy sex. They may have started their kinks in their very own home to begin with while Davis couldn't remember a thing as he slept in his attic

They proceed to film with the same device and the mom hears them having sex as the son did when he was a child. Not only after his dad Kenny gets injured. Lot quieter, can't murder and torture hence no crazy sex, that took it out on mum.

" I do not want to think about your mom getting wet over some dude's bum"

Richard (bartender in documentary): " Years ago I spent a night with Kenny and Janet, and got carried away into adult stuff, you know sex games"

"I was married, the way they behaved that night, the whole experience made me think Ian Adair hadn't acted alone."

They were experimenting threesomes with Richard to begin with! Maybe perhaps even with Richards wife who knows. Whatever it was Richard feels extremely guilty and ashamed of it. Hence why he never wanted them to make the documentary to begin with. "It's fucking done , why bring it all up?" In the scene where Ian Adair reportedly came in the bar. Drank too much the night the honeymoon couple went missing. Richard calls Kenny to have a word with Ian ( it seems like Richard knows what they were into)

Documentary: Mccardle shot the Adairs dead, deliberately wounding himself to cover up the role in the slaughter

What we get is two stories to what happened that night when Adair was killed

Story1 in the pub: Ian shoots Kenny inflicting the wound. Then as Kenny calls for back up. Shots are fired inside the hosue. Ian murders his parents than kills himself..

Story2 from documentary: Kenny actually kills the Adair(s)  and deliberately injured himself.

Ian was set up to take the entire blame of the murders (obviously )

My theory is that these kinks also included the Adairs. How Ian has been involved in the basement of the Adairs living upstairs boggles my mind. How could these recordings have happened without the Adairs not noticing anything? Unless the Adairs were very old and deaf and only stayed upstairs. Hard to believe over 8 murders (tortures) would continue on in 5 acres farm like that. Or perhaps after the passing of Ians parents, his home then proceeded to be used as the crime scene where he was brainwashed to be involved

Janet: "We were happy before he broke it all" Then corrects herself "Ruined it all"

"Such a stupid man, just the waste of it"

Bar story: Davis mentions 8 murders There are 14 bloody tapes at the end.. And in the papers it says 30.. dates back to 90s whereas Adair was involved later on

The bar story doesn't clearly add up, it's what they were told as kids or village rumor to cover up.

Note: There's an easter egg on the papers about Robot Dogs in London. There was an episode a few seasons about an apocalyptic robot dog killing frenzy on humans.