POSTSCRIPT

I started this book with an anecdote about how the world appeared to have changed before I started writing. People were Tweeting in a live conference, people were expecting to announce their presence at a coffee bar over the Internet. Closing the book down I see things are changing again.

I’m taking my family out for a day. We are very excited – well, two of us – because we’re going to see The Doctor Who Exhibition at London’s Olympia. Doctor Who is one of the top family TV programmes in the UK, surrounding a time travelling face changing hero who travels the universe righting wrongs.

There are exhibits in the foyer before you get to the main thrust of the thing, which is a sort of virtual adventure in which the audience takes part. ...

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