In the British radio comedy show, Cabin Pressure, the following exchange of dialogue occurs:
Martin: Your doctor? What doctor do you know?
Simon: Good old Doc Smiley, of course.
Martin: What, Nathan Smiley from school?
Simon: That’s right! Remember him, do you?
Martin: Of course I remember him, he threw my briefcase on the science block - and he’s a podiatrist!
Simon: And a bloody good one.
What does "science block" mean in this context? It seems to be some Britishicism, but I'm not entirely sure of the meaning.