They made plain from the start, in interviews etc, that this was a not a remake of the previous series or a pure adaptation of the books. It's mostly the books and some 'real life' bits, plus new themes.
Part of it is having Mrs Hall as a servant with no stories or inner life etc isn't really in keeping with modern storytelling, nor having such passive female characters.
The real family of Alf were more involved in casting etc this time and were much happier. They were reportedly very unhappy with a lot of the original, especially Christopher Timothy.
From.thw very beginning they've had a strong and warm relationship between Siegfried and Audrey, they've held hands a few times and clearly care very much about each other.
He also believed in her when she was at her lowest, having been sacked because of Edward's theft .
I think without her to keep him on an even keel, worrying about Tris and then having two small children (Jim and Rosie) Siegfried just went to pot over the 3 1/2 years.
Helen and the children moved to her Dad's, Jim goes back and forth between Skeldale when on call and the farm tg rest of the time.