This is quite a tough film to watch. Not so much because of the subject matter, but because you just know there is an inevitability about the conclusion which is going to leave everyone damaged! Anne Reid is good as the eponymous character ("Mary") who loses her husband and finds that she just cannot go home. She spends her time between her son and his family and with her daughter and her young son. The former is having his house extended, and so has employed "Darren" (Daniel Craig) - who just happens to be the married boyfriend of her daughter "Paula" (Cathryn Bradshaw). Lonely and craving…