Name of film

This is for UK viewers. About 5-7 years ago a director’s first film was shown in the UK. I don’t know the name of the actors. It’s set in northern England in the 30’s or 40’s i think. Young teenage boy on his paper round cycling down a hill when he is hit by a car. The male car drive stops picks up the dead boy and takes him home, where his wife cleans up the boy’s facial injuries and puts new clothes on. The film isn’t that long and ends when the man puts the boy’s body in a home made coffin and buries it in his garden. As the film ends you can see there are lots of wooden crosses in the garden, so you presume the guy has murdered or accidentally killed many people before.