debt helpers

Can the name of this movie?

It was on TV yesterday. The main characters are Matthew & Grace. We talked about an old woman the husband died and left her in tons of debt, which was a professional gardener. Your help around the house was trying to grow marijuana in the bushes nearby, and without Success finally came in (professional) and increased the mass amounts of pot and tried to sell in London. This is a comedy based in England. Very funny! I try to find the name of Cinema, please help if you know. Thanks

The name of the movie's saving grace. http://www.imdb.com/title/tt0195234/.