there is NO WAY Catherine would have let the injunction lapse
To me, this was the least credible part of the episode. Catherine would NEVER have let it lapse - not in 1,000,000 years.
I have a theory...
Catherine's ex-husband is actually Ryan's father. He was abusing their daughter, hence her going 'off-the-rails' and her distress at being pregnant and suicide after Ryan's birth.
That's interesting @Wisterical . . especially, as you say, coupled with the heartbreaking incest line in the second series.
<smell of burning rubber as the Viper thinks really, really hard>