What is the plot of "Look Back in Anger"?

Osborne's Look Back in Anger, a play
in three acts, is largely modelled on the Scribean "well-made play". Set in the small
attic apartment in the Midlands, the entire action takes place in the restricted
drawing-room space of the said apartment.

Jimmy
Porter, the angry young Osborne protagonist, is introduced with his wife Alison at the
"the ironing board" and his friend Cliff, both Jimmy and Cliff reading the Sunday
newspapers. Jimmy is loud,  rude and verbally abusive to his wife, Alison. Alison comes
from an upper class family that Jimmy abhors and he berates Alison for being too
reserved and unfeeling. Jimmy is a university graduate, but works with Cliff, operating
a candy stall.  The  opening situation introduces us to the three main characters and
refers to many others who are absentee characters : Alison's  parents, her brother
Nigel, Jimmy's former girl-friend Madeline, his former friend Hugh and Hugh's mom.
Jimmy's aggression towards Alison who belongs to the upper class reaches a flashpoint
When Jimmy pushes Alison while she is at the ironing board, and she is burned. Alison
confides to Cliff that she is pregnant. She is frightened of Jimmy's reaction to this
news, and has not told him. Alison receives a phone-call to know that her actress
friend, Helena Charles, is coming to stay at the flat. This typical device to indicate
the entry of a new character through a phone-call is quite common in "well-made" plays.
In his anger, he curses Alison for her cool demeanor, and wishes that she would have a
child and that the child would die so that she could  suffer and  break her cool
demeanor.This serves as a significant pointer in the development of the plot for Alison
really suffers a miscarriage to return to her husband in the end to mark the
circumambulation of the plot.

Helena arrives, and when
Helena has had enough of Jimmy's bitterness toward Alison, she convinces Alison that she
should allow her to call Alison's father to take her to the family home. Jimmy receives
a phone-call to know that his patroness, Hugh's mom,  has had a stroke. Jimmy begs
Alison to come with him to see her but Alison goes with Helena to church. Jimmy visits
Hugh's mom in the hospital and she dies. Again this is a death of a person he loves just
as he, in his boyhood had seen the slow death of his father injured in the Spanish Civil
War.  Alison's father arrives and leaves with Alison. Helena stays back to initiate a
new phase of relationship which contrasts with the Jimmy-Alison relationship
.

Several months have passed, and it is another Sunday
evening. Helena has stayed back, and Jimmy and Cliff are up to their usual discussion of
the Sunday papers.  Helena, wearing Jimmy's red shirt and standing by the same ironing
board shows a parallelism typical of the plot of a "well-made play". Cliff who has so
long served as a buffer between the two opponents, Jimmy and Alison, is now redundant.
Cliff leaves Jimmy.

The plot of Osborne's play comes to a
rather trite end with the sudden return of Alison some months after her most tragic
experience of miscarriage. Helena immediately withdraws leaving Jimmy for his wife, and
Jimmy too takes Alison in his embrace to go back to the fantasy world of the bear and
the squirrel.

The plot of Osborne's play thus shows the
regular "well-made" structure having complications with parallelisms/contrasts, and a
circumambulatory finish to satisfy the expectations of the
spectators.