'Surely this has been done before? The answer, invariably, is: ‘Well, yes, it has been done,’ (after all, what hasn’t?) ‘just not in this particular way...'

You know an idea has legs when it simply won’t go away. Sometimes it seems too good to be true. Surely this has been done before? The answer, invariably, is: ‘Well, yes, it has been done,’ (after all, what hasn’t?) ‘just not in this particular way...