The pair met at Oxford University. Early on, Luke described Sanjay as "the best mate I've ever had all my life." He was down the hall from Luke at Oxford. Luke said they clicked straight away; "He's smart, he's cool, he keeps making me laugh." Clyde Langer was jealous upon hearing of his new competitor. (TV: Death of the Doctor) Sanjay studied biology. (PROSE: Death of the Doctor)
At some point the two made a bet that Sarah Jane would ask if they'd finished their work — two thousand words on pendulum physics — before going out for a burger with everyone else. Sanjay therefore owed Luke five pounds. (TV: Death of the Doctor) Luke later had to end a conversation with Sarah Jane and Rani Chandra in Ealing because he'd promised to meet Sanjay at the Union. (TV: Goodbye, Sarah Jane Smith)
Behind the scenes
While the The Sarah Jane Adventures was still in production, the plan was that Luke would have come out as gay and Sanjay would have been his boyfriend. Sadly this never came to pass on television, due to Elisabeth Sladen's passing.
- DCOM: Death of the Doctor
- Hypable Staff (5 July 2013). Russell T. Davies dishes on 'The Doctor Who' spin-off: 'The Sarah Jane Adventures'. Hypable. Retrieved on 17 December 2013.