"Girls' Night" (a misleading title) tells of two middle aged, working class English women best friends and what happens when one is diagnosed with cancer. Although the film is about a last blast in Vegas and the usual throes of terminal illness, the greater story and substance shows how people grow and mature through their experiences and encounters with others. A very well managed and typically austere little Brit flick, "Girls' Night" is a character-driven drama which is more uplifting than woeful, features sterling performances by the Blethyn and Walters, and serves up positive subliminal messages instead of wallowing in grief. Most likely to be appreciated by more mature audiences, particularly females. (B)