In the novel To Sir, with Love, what is the role of love?

In its different forms, I would say that love plays a
fairly important role in Braithwaite's work.  On  one hand, there is the obvious love
that Braithwaite develops for his students.  While not evident at the outset, over the
course of the narrative, Braithwaite and his students develop a love for one another
because both see one another in the vein of respect and true regard.  With the success
he experiences in the classroom, Braithwaite becomes loved by the community, as well. 
There are some intimations that Braithwaite and Blanchard might have some feelings for
love for one another and that Pamela Dare is infatuated with Braithwaite.  Yet, I think
that the greatest level of love and its strongest display is most present with how
Braithwaite comes to view the craft of teaching.  By the end of the narrative,
Braithwaite comes to understand that his true identity is that of a teacher and with
this, there is a level of love present.  It is not that he "loves" teaching, which
Braithwaite certainly might feel.  Yet, rather it is the secure understanding that his
identity as a human being is linked to the craft and vocation of teaching.  This shows
an internalized love or connection to teaching and the profession of being an
educator.