Channel 4 or 5, about two kidnapped girls. Started about 11pm and by 12.30pm , just half way through it, I was too tired to stay up, so dont know the ending . What happened - were they found alive, and who dunnit?

Prisoners (2013) Channel 4

Full synopsis HERE

Wow , brilliant, I didnt know CH4 did synopsis . Thats excellent thanks. Would never have guessed the answer !

It's a mainstream movie, IMDb has synopsis for most films.