This is a really long shot but if anyone will get it, it's you guys! I'm really into crime dramas and I remember watching a really good one with my mum several years ago but can't remember what it was called (or much about it tbh!)
It was around 2010, it had several episodes - maybe 3 or 4. It was about a female who was kept captive in a house with a male. She was told that men in white vans were spying on her and monitoring her so she couldn't leave the house. I also think there was something to do with a basement or a trap door with a rug that covered it? It would have been on one of the mainstream UK channels so BBC or ITV probably.
Does this ring any bells for anyone or does anyone know what it was called?