POSSIBLE SPOILER AT THE END OF THIS POST!
It probably was far-fetched, travelasfar, but most dramas have an element of that, which is what makes the story engaging. Many 'true-life' stories have added scenes to make them dramatically interesting, and those who don't are often a bit boring. Real life is not as interesting as drama (mine certainly isn't!).
I agree that the end was daft, but I thought it might be replicating the way that someone 'kidnapped' her mum from a care home because she (the mum) wasn't allowed to leave. not quite the same, as in the drama they broke into a caravan, and Tony didn't really have agency to consent (or did he?).
Anyway, apart from that, I thought it was excellent, and I think we need more TV that challenges the government (whoever they are - not just this useless bunch), in the manner of Boys From The Blackstuff, or Cathy Come Home.