JKR: I wrote Platform 9 3/4 when I was living in Manchester, and I wrongly visualized the platforms, and I was actually thinking of Euston, so anyone who's actually been to the real platforms 9 and 10 in King's Cross will realize they don't bear a great resemblance to the platforms 9 and 10 as described in the book. So that's just me coming clean, there. I was in Manchester, I couldn't check.