Lennie James and Paapa Essiedu play the father Salter and three of his batch of cloned sons.  The very act of cloning is in itself a challenge to the sense of self and individuality for these men.  The first one we meet wants to know if he is the first but his father doesn't tell the truth.  Salter, the father, talks about litigation and suing someone for the loss of identity.  He implies that the cloning of "a number" was carried out without his consent.