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A couple of years back, progressive audiences flocked to arthouse cinemas to see a clever German film. Good Bye, Lenin! told the story of an elderly East German woman who had to be protected from news of the fall of the Berlin Wall. Her family rustled up a reasonable facsimile of life under communism, digging out Soviet-era jam and ersatz coffee. Soon, someone may have to do something similar for Gordon Brown. Perhaps they could build a 10A Downing Street, where Charlie Whelan, Ed Balls and Damian McBride could read out old copies of the Daily Mirror, while David Cameron and Nick Clegg settle into difficult new jobs in the real building next door.