From NetFlix:

Looking to earn some cash — and to get out from under the
thumb of his domineering mother (Laura Linney) — shy teen
Ben Marshall ( Rupert Grint) goes to work as an assistant to a
tetchy retired actress (Julie Walters). But what begins as a
simple summer job soon turns into a life-changing experience
for young Ben. Nicholas Farrell plays Linney’s henpecked spouse
in this affecting coming-of-age drama from director Jeremy Brock.

I can’t even remember how I stumbled upon this small gem of
a movie. Laura Linney plays to perfection an evil religious hypocrite.
Rupert Grint captures “downbeaten teenager” like no one else.
Even Kathy loved this movie (and that’s saying something).

It’s a definite feel-good with some strong language from gritty
Julie Walters.