Helen pre Ron/Rob - clicky hips as a baby. Completely cured, I think. Last time I mentioned this Asking supplied some details I'd not known, which I think were that Pat removed the cast too early and was consumed with guilt that she'd done Helen lasting damage. That would explain a lot.
Helen went to a specialist dairy/cheesemaking college after school and did one or two placements elsewhere. I think it was during that time that John died. There had been tension in the family immediately prior to the accident because John when younger had got involved with Sharon Richards, who was older than he was, and had a very young child (Kylie Horrobin), whose father was Clive Horrobin, armed robber and general scumbag. (Later arsonist and attempted murderer too.) Clive is brother to Susan and Tracy, and currently in prison, I think. Clive had got bored with family life very soon after Kylie was born and left Sharon to it. John and Sharon didn't last long the first time, but some time later when John was in a steady relationship with a nanny from Birmingham, Hayley, who'd moved to Ambridge for work, Sharon re-appeared and she and John had a fling. (Decades later we learned that Johnnie, Sharon's son, was the result, and he moved to the farm and did an apprenticeship. Sadly, he has been silent for a long time and is currently sailing around the world on a training ship.)
Anyway, Hayley found about John and Sharon and broke things off. John realised it was Hayley he really wanted and proposed marriage, which Hayley refused. It was while he was still very upset about all of this that he went out on the tractor and had the accident. Naturally there was a lot of guilt from everyone left behind.
John had recently set up a pig business at Bridge Farm. In the aftermath of his death Hayley and Tom (then about 16, I think) tried to keep the pig business going. Helen returned from college and was extremely high-handed about Hayley's involvement - basically sent her packing, on the grounds that she was trying to take something that belonged to the family. Pat became clinically depressed and went away for a time to a convent in Wales (you might not know this, but Pat is Welsh - no, not a trace of an accent now). Helen took a break from her studies to run the dairy in Pat's absence and managed to rub everybody up the wrong way.
The eating disorder must have been after that, but I can't remember much about the details. Or maybe it was after the next bit. Did she have in-patient treatment? Can't remember now.
Anyway, in the early 2000s she got involved with Greg, a gamekeeper, much older than she was, very bad divorce in the background, extremely depressed about the loss of a relationship with his two daughters. That didn't go well. Eventually he killed himself, not long after Helen had told him she wanted a break to work out how she felt about the relationship.
The incident Asking mentioned above came after that, I think - Helen was drinking too much and one evening insisted on driving back from Borchester while over the limit. She knocked Mike Tucker (Roy's dad) over and he was injured. She got Tom to say he was driving because he hadn't been drinking and would pass a breathalyser. Tom took a lot of flak for that and Helen eventually confessed to Mike Tucker, who was surprisingly forgiving, and didn't tell the police. Neither did Helen. I don't know if she told Pat and Tony, who have always had it in for Tom. Helen is the Golden Child.
At some point after that, one of Greg's daughters ill-advisedly came to live in Ambridge for a bit and shared the flat over the post office with Helen. It belonged to Helen's grandma, Peggy Woolley, who rented it to Helen ahead of more deserving candidates because Helen took a fancy to having her own place instead of living at Bridge Farm. Helen tried to control Annette's life and was oblivious to the fact that her boyfriend of the time had coerced Annette into sex. Annette became pregnant. When Helen found out, she tried to persuade Annette to have the baby and let Helen adopt it. Annette very wisely left the area so she could have a termination. In the aftermath, Helen decided that she wanted to have a child as a single woman and went to a fertility clinic where she became pregnant on the first attempt.
Tony was aghast and that led to a coolness between them which ended when Henry was born on 2nd January 2011.
Thanks for reading, if you got this far!