IMDB says... A look at a few chapters in the life of Poppy, a cheery, colorful, North London schoolteacher whose optimism tends to exasperate those around her.
Sally Hawkins is very good at playing an irritating character who thinks she can fix every situation if she disparages those around her gently enough. And yes all the challenges that are supposed to give her more gravity, such as the homeless guy, the bullying kid, the deeply wounded driving instructor, are freeze-dried characters who are reconstituted just in time for the plot.
I'm too uninspired to provide a clip. Here's a clip courtesy of IMDB. Now imagine a lot more of this.
The impossibly sensitive and impossibly hunky boyfriend who shows up in about the tenth reel should get the hell out - now. She will chatter him into his grave.