It won't change your life. There's no road to Damascus moment and neither is it seminal. However, it is well acted, especially Kelly McDonald who's superb in everything she does, and Miriam Margolyes, who is the same, with a story that will leave you with a warm feeling inside.
I'm not sure why I liked it, but like it a lot I did.
It ticks along at a steady pace, being both humorous and entertaining, giving the viewer the impression the cast also enjoyed acting in it.
On the negative side, there's no bad language, no nudity, no confusing plot and no pointless CGI. On the positive side, it is fun.