I recall reading that Chapter 36 details Sai Baba's interactions with people from London. Where can I find that part?

The information you recall may be from a different source, as Chapter 36 of the Shri Sai Satcharitra does not detail any interactions with people from London. This chapter focuses on the infinite greatness of saints and describes Sai Baba as one who can "turn a beggar into a king in a moment with the play of his eyebrows." It highlights his love for his own stories and notes that "He is the swan in the lake of the Supreme." The only visitors mentioned specifically at the end of the introductory section are "Two gentlemen from Goa" who came for Sai’s darshan, not anyone from London.