Tragically I was an only twin

subtitled The Complete Peter Cook is an excellent book by (isbn 0-09-944325-2). As usual I'm going to quote from a few pages:

Builders of Xanadu (Saturday Live, Channel 4, 1986)

...
John Bird: Got the job then?
Peter Cook: Yes, got the job.
John Bird: Big one?
Peter Cook: Well, fairly big. He's got very grandiose in his old age, Kubla has.
John Bird: Well what does he want? An extension?
Peter Cook: No, no. More than that. He wants a pleasure dome.
John Bird: Nice. What sort of pleasure dome did he have in mind?
Peter Cook: Well, he was a bit vague about it. He rambled on a bit. The only adjective I got from him was 'stately'. In fact, that's what he decreed.
John Bird: Oh, he's decreeing things now then, is he?
Peter Cook: Certainly. No pissing about with planning permission for Kubla. If he wants a stately pleasure dome, wallop! He decrees it.
John Bird: Yes, well why not?
Peter Cook: Why not, at his age?
John Bird: Did you bung him an estimate, then?
Peter Cook: No, it's a bit tricky, you see.
John Bird: What's the problem? A pleasure dome's straightforward enough. I don't know about this 'stately' though. What's this 'stately'? That's new to me. What's that? Plants? Hammocks? Not structural, is it?
Peter Cook: No, it's not structural, 'stately'. It's more of an ambience sort of area.
John Bird: Well then, we'll just budget for a regular pleasure dome, and see if we can pick up some stately trimmings down the market.
...
Peter Cook: ... Part of his decree, vis-à-vis the stately pleasure dome, is he has this bloody sacred river Alph running through the structure.
John Bird: A sacred river?
Peter Cook: Running right through the structure. He specified that.
John Bird: We'll need a plumber then. I can have Ronnie bodge up a river for you and we can bung up a sign saying 'Sacred River of Alph'. Something along those lines.
Peter Cook: Yes, but we've still got a problem with his specifications.
John Bird: What's that, then?
Peter Cook: These caverns he wants.
...
Peter Cook: ... with these caverns, you see, he's specified, here, on the docket there, 'measureless to man'.
John Bird: Measureless? He wants caverns you can't measure?
Peter Cook: Yes.
...