I liked it and I think northernlurker is right. If you believe there are witches but that most people don't believe in them the whole thing makes sense.
The main thing I can't reconcile is Aiden Gillen's complete change of heart, it would have been better if he'd have been a git to outsiders but got on fairly well with his son apart from some dad/son teenage angst which would have explained the friction and given an excuse for the son to betray him which apart from the charm would have made everyone in town believe he'd done it.
They should have given him a job too. Even if he was a drug dealer, in fact, that probably would have been quite a good one to give him. It wasn't sensible that he'd been unemployed for 14 years and his son didn't realise.
But there were very 'earthbound' things in it like the police being quite crap, the searchers trampling all over the crime scene and causing more trouble than they're worth, the uneasy relationship with Steve and his BIL and son, the vigilantism and mawkishness, people wanting Malcolm and his wife to get their comeuppance because they were rich...
I didn't know about that Crimewatch story someone mentioned where they had an appeal and everyone started shopping everyone else. But it's very realistic.
People do gossip, they're easily led, they want to settle scores and they are oddballs in every town either really dodgy or harmless that can get the blame.
I think Aiden Gillen raped WPc Walliams 20 years before. But I think that he not only didn't think it was rape, he didn't even remember it. I can see how she'd want revenge.
I think it's believable that she'd want to stay with her husband and cover up for him. It's horrible, but people do.
It also didn't matter that you didn't see Seth's body. You saw Hattie's dad attack him, you heard him scream and you saw the blood. He's dead.
Isn't part of the Green Man myth that an innocent gets sacrificed. Don't really know but I'm dimly aware of it.