What is the theme in Plenty by David Hare?

Much of the themes of duty and responsibility in Plenty revolve around social expectations and patriotic obligations. Susan fulfills her patriotic duty to England by serving in the resistance efforts during the war. Likewise, Brock, Darwin, Begley, Charleson, and M. Aung's service in diplomatic positions reflects their patriotic responsibility to represent their countries. Both Mick and Brock attempt to meet the traditional social responsibilities of men in that Mick tries to father a child with Susan and become involved with her while Brock later cares for Susan financially and emotionally as her husband. Interestingly, many of the characters in this play can be described as failures in these respects.