Going underground

You are the 1933 Beck Map! A diagram rather than a
true map, you distort what you represent. A
thing of engineering beauty, many after you
will form themselves in your image. Hand me
that 3/8th Gripley, would you?
Which London Underground Map Are You? brought to you by QuizillaHm, wat ik hier nou weer mee moet? Ach nouja. Maar uit welke pratchett kwam die 3/8th Gripley nou ookweer? Iets in de zin van:
- Hand me that 3/8th Gripley, would you?
- What's a 3/8th Gripley?
- Doesn't matter, just hand it to me!
De inzender met het juiste antwoord krijgt een verrassing!