From delamaidefoodblog, an assessment of Michael Kitchen as the ultimate father figure in Foyle’s War:
But the show belongs to Michael Kitchen and you wonder why you’ve never seen this actor before and when you will see him again. He conveys the competence and integrity you want in your hero, but the real attraction, I think, is that he is the ultimate father figure. He is concerned about people without wearing it on his sleeve; gruff, even curt, but letting us glimpse the tenderness behind it; and he is wise, not only a clever detective but wise in the ways of the human heart. He is a father not only to his son, Andrew, an RAF pilot, but also to Sam and Milner and to any number of characters in the various episodes, including his goddaughter in the last (final?) episode. Invariably, this father knows best. While he conveys a sense of vulnerability, you never have the feeling Foyle has really made a mistake. This is why I think the films are comforting. With all the chaos of war, and darkness of human behavior, Foyle moves through it all, self-possessed, caring, and ultimately, even when circumstances beyond his control keep him from actually incarcerating the wrongdoer, successful in protecting his charges from evil.