Cloud Nine: what is the relationship between national and racial identity in Churchill’s play?

Cloud Nine (https://www.dramaonlinelibrary.com/playtext-overview?docid=do-9781408162934&tocid=do-9781408162934-div-000000980

1: What is the relationship between national and racial identity in Churchill’s play?

2: What is the relationship between the past and the present in this play? How does time work and to what ends? How does Churchill approach concepts like history, linearity, and continuity?