Away We Go is the name of Sam Mendes's fifth film, released in Britain this week. But the title could also serve as the buccaneering mantra of a Cambridge-educated Englishman whose career continues to shed any whiff of his home country. On stage or screen, the director is continually drawn to stories culled from across the Atlantic, where he now lives. And why not? If you had directed a first film called American Beauty that would lead to five Oscars and America eating out of your hand, you, too, might well return for more. Mendes's output isn't merely a reflection of his taste, although that part of it is important, too; it's common sense.