That is big problem with this production. Whilst the content would obviously not shock viewers today in the same way as it did 34 years ago, it could still have been a damn good drama. Instead they appear to have done a "Bouquet for the CSI generation"..and don't get me wrong, I like CSI.
But this needed the the characters to be revealed slowly, gradually stripping away the layers of apparent respectability.
From memory, Gavin was originally an American with a degree of charm, not some boorish oaf from "up north". For a drama like this to work, they needed time to set up each character, to put some flesh on the bones. It's all been told at breakneck speed and lost any of the original mystery, revelations coming every 5 minutes..even soaps do a better job !
I guess it will turn out ok for what it is..a rather dumbed down version. A pity though, it could have been so much better.