It's been out for several weeks in Oz, but I see from "The Guardian" that it's just been released UK side. Go and see it. It's properly cinematic in its photography despite the feel-good/Channel 4 vibes which publicise it - not a tv film shown in cinemas.
Stay for the credits at the end.
Great soundtrack.
Lovely, lovely film; its heart in the right place but with stuff that has you heart-stopped with tension.