The analyses of a text #1

The narrator recalls his adolescence.
He is an apprentice of the lawyer Mr. Spenlow.
He promised his best friend Steerforth yesterday that he visited his house in Highgate today.

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As I did not care, however, to get to Highgate before one or two o'clock in the day, and as we had another little excommunication case in court that morning, which was called The office of the judge promoted by Tipkins against Bullock for his soul's correction, I passed an hour or two in attendance on it with Mr. Spenlow very agreeably. It arose out of a scuffle between two churchwardens, one of whom was alleged to have pushed the other against a pump; the handle of which pump projecting into a school-house, which school-house was under a gable of the church-roof, made the push an ecclesiastical offence. It was an amusing case; and sent me up to Highgate, on the box of the stage-coach, thinking about the Commons, and what Mr. Spenlow had said about touching the Commons and bringing down the country.
[David Copperfield by Charles Dickens]
1. I'd like to know if "which pump" means "the very pump."
2. I think what is the subject of "made."
3. And I'd like to know how "it" can send him to Highgate.
Thank you in advance for your help.